CenturyLink vs. Xfinity Internet Providers Compared

CenturyLink’s DSL internet has wide coverage but slower speeds

CenturyLink is a DSL internet provider owned by a parent company known as Lumen Technologies. Lumen is the seventh-largest ISP in the U.S., based on its combined internet service in both DSL and fiber. Lumen serves a total of about 3 million customers [1]. CenturyLink is the DSL brand owned by Lumen. The fiber brand of Lumen is now known as Quantum Fiber. This review will focus on the CenturyLink DSL half of the Lumen brand. We will cover Quantum Fiber in a separate review, because the two brands provide very different technologies. If your only available internet is CenturyLink, your DSL connection is likely to be slower than if you have cable or fiber. DSL speed can vary widely depending on your neighborhood and even on the wiring in your home. But CenturyLink, like most DSL companies, will charge you the same price for a slow 10 Mbps download speed as for 100 Mbps download speed. It’s luck of the draw, with no price break for slower service. DSL customers just aren’t getting the same kind of value that fiber customers are getting. And that’s one probable reason that Lumen separated its two brands. Now, it should be easy to tell what you’re getting – mostly.  CenturyLink is DSL, and Quantum Fiber is all-fiber. On websites that still mix the two names, though, the speeds of each plan will often be a giveaway. CenturyLink sold half of its DSL network to Brightspeed in 2022. CenturyLink now has a very unusual coverage footprint: think of it as the Western half of the United States, minus California, plus Florida.

CenturyLink DSL charges high prices for widely varying speeds

DSL is not one of the faster internet technologies on the market. Usually, DSL customers sign up for their plans because there is no cable or fiber internet in their areas. And that can be a valid choice if DSL will give you better performance than satellite internet, though you have to evaluate that on a case-by-case basis. Many times, DSL plans are good options for customers in rural areas. CenturyLink plans are no exception to the general qualities of DSL. You will generally pay around $50 for your DSL package, whether you get 10 Mbps download speed or whether you are lucky enough to get 100 Mbps download speed (very unusual for DSL and true for only 28% of CenturyLink DSL customers) [2]. In better news, CenturyLink’s DSL plans are free of data caps. So, despite the fact that CenturyLink’s DSL prices are high for the speeds, at least you won’t have unexpected data overage charges.

Xfinity stands above the pack for its low initial pricing, but pay attention to the later price hikes and fees

Xfinity is the largest internet service provider in the United States, with 32 million broadband subscribers [1]. Xfinity is a subsidiary of cable giant Comcast. Company size and strength gives Xfinity the ability to offer very low promotional prices to consumers for a year or even two years. Xfinity’s promotional plans begin around $40/month. Here's the kicker: after a year or two, your promotional rate will end. At that point, your rate can go up by anywhere from $25 to $50 per month. And Xfinity pricing varies all over the country and is pretty complex in how it changes from plan to plan. By our evaluation standards, this lack of simplicity in pricing hurts Xfinity’s rating despite its great initial promotional rates. In addition, Xfinity’s lower-tier plans have data caps that apply under certain conditions. The data cap is 1.2 TB (terabytes) per month, which is enough to cover many households’ monthly usage without any trouble. However, the Benton Institute for Broadband and Society analyzed data from OpenVault to show that 14.6% of homes used more than 1 terabyte per month, and 2.4% used over 2 terabytes per month [2]. This data suggests that 1 in every 7 homes would run a risk of exceeding the Xfinity data cap. Comcast/Xfinity claims that it does not throttle internet and slow it down, however, Xfinity will charge you overage fees if you exceed your data cap [3]. Those fees can go up to a maximum of $100/month [4]. Odds are that you won’t exceed your data cap. But if you have lots of real-time gaming or heavy streaming in your household, the extra cost for data overage could really add up. With Xfinity's top tier plans, though, you will get unlimited data.

“But it was so fast in the ‘90s!” DSL shows its age in many locations

CenturyLink DSL uses one of the oldest internet technologies: copper cables originally designed as telephone wire. About 47% of CenturyLink customers achieve speeds up to 30 Mbps. On the flip side, a lucky 27% are able to achieve 80 Mbps or more, delivering a much better experience [5]. If DSL gives you under 10 Mbps download speed and only 1 Mbps upload speed, you won’t be able to play real-time games online with any kind of reliability. You may also experience glitching if multiple people stream or videoconference at the same time. To be fair, some DSL connections will give you faster speeds. However, if you are considering ordering CenturyLink DSL, be sure to research your other options. You can test your actual speed here to see what kind of performance your current internet connection is giving you.

Xfinity’s hybrid fiber/coaxial cable supplies gigabit download speeds but slower upload speeds

Though Xfinity has advanced cable technology and good speeds, their network seems to be more prone to outages than users would like [5]. That’s the major reason Xfinity gets a lower rating for performance, in addition to the intrinsic differences between cable speed and all-fiber speed. Xfinity uses technology that is mostly fiber but uses coaxial cable for a short stretch of your internet connection. This type of connection is known as hybrid fiber/coaxial cable, or HFC. An HFC internet connection is better than older cable technologies because it can supply download speeds up to gigabit speeds. HFC will give you faster, more reliable internet service than DSL, satellite internet, or fixed wireless internet. And for streaming in HD, this hybrid fiber- cable internet will certainly be able to support multiple devices. The major difference between HFC and an all-fiber internet connection is upload speeds. Your upload speed will be no faster than 35-50 Mbps. An-all fiber connection, by contrast, will give you the same upload speed as your download speed. Your upload speed will affect activities such as gaming, videoconferencing and large file uploads. The good news is that if you have an upload speed of 35 Mbps, you’re still going to be able to upload pretty quickly. For most average households, 35 Mbps is enough. But if you have four or more people in your household streaming HD, playing games, working from home, and videoconferencing simultaneously, you’re going to want all-fiber internet, or what is often called “fiber to the home” (FTTH). Xfinity does have one all-fiber connectivity option that is full FTTH. If your household’s location is eligible, Xfinity will install an FTTH connection for their Gigabit Pro plan. Gigabit Pro is up there with the fastest fiber plans on the market.

Option to use your own modem/router or self-install your connection

With the CenturyLink DSL plan, there’s a $15 a month modem/router rental fee, which is on the high end of equipment fees. You can avoid the modem/router fee by buying your own. And that might not be a bad plan, given that you will make up the price of a typical modem/router in a year or less. You may have to pay for a professional installation, which is usually a one-time fee of $99. Fortunately, in many places you may also have the option to self-install for $15. It depends whether there is still a working CenturyLink DSL connection in your home.

Xfinity offers two different gateways and popular Flex 4K streaming TV box

For TV fans, Xfinity internet service brings the added bonus of its free Flex 4K streaming box [6]. This convenient gadget will work much like a Roku box to consolidate your streaming apps, plus give you over 10,000 free movies and shows, free channels, and a voice remote. Xfinity TV customers are not eligible for a free Flex 4K, however. For your modem and router, you will get the xFi Gateway with its multi-gig speed capability, Wi-Fi 6E, parental controls and security protection [7]. Or you can upgrade to the xFi Complete, which includes unlimited data. Both require a rental fee after the promotional period that could be $15-25, which is part of why your price goes up. If you use your own router and modem to avoid the equipment fee, you will have to live with the 1.2 TB data cap. Installation fees will be similar to other providers at around $100 for a technician install and $15  for a self-install ($15).

CenturyLink runs below average in some satisfaction rankings

CenturyLink’s customer satisfaction rankings vary widely by region on the J.D. Power survey [3]. In the North Central region, CenturyLink ranks above average. In the West, CenturyLink ranks slightly below average, and in the South, CenturyLink is second from last in customer satisfaction. The North Central and West regions where CenturyLink/Quantum Fiber rank higher are also the regions in which Quantum Fiber provides most of its fiber access. The South only includes one state with fiber internet coverage, which means most of that low customer satisfaction rating is based on CenturyLink’s DSL. According to the American Customer Satisfaction Index, CenturyLink's DSL service scored 62 out of 100 in 2025, which was the same score they received the previous year. For CenturyLink and Quantum Fiber, these customer satisfaction rankings tell the story clearly. CenturyLink’s DSL service is not as likely to please you. However, be aware that there is a certain amount of online cross-marketing between the two companies. So, if CenturyLink says they are able to sell you “fiber” as they seem to imply on their homepage, all that means is that they’re going to send you to a Quantum Fiber plan if your address has fiber availability.

Xfinity Customer Service shows improvement

Xfinity has not been known for strong customer service over the years. Online reviews continue to mention some problem areas. But Xfinity has been moving up in official rankings, and for that reason, we give them 4 stars for improving their customer experience. Xfinity has customer support on its website, with 24/7 chat for help and 24/7 tech support. An online status center allows you to check for outages and troubleshoot your service. The Xfinity app will make your online customer experience more streamlined. You can also find Xfinity help communities through Facebook, Twitter, and Reddit. Customer service rankings have been improving for Xfinity in recent years. In 2022, Xfinity ranked third in three of four regions in the J.D. Power Residential Internet Service Provider Customer Satisfaction Study  [8]. This ranking reflects Xfinity’s recent effort to improve their customer support. Though Xfinity’s customer support ratings from other sources are not always as high, overall, signs are getting better that you will be satisfied with your customer experience.