ARRIS (SB6190) - Cable Modem - DOCSIS 3.0 32x8 Gigabit Modem, For Comcast Xfinity, Cox, check with ISP for compatibility [Not for Spectrum] 1 Gbps Port, 800 Mbps Max Speed, 2 Year Warranty - White

No complaints here! Connected to a Synology RT2600ac, and together they keep our whole house connected, all 9-13 devices online at a time. It was easy to set up, following the manual it comes with. Called Comcast to let them know we have our own modem, and to tell them the MAC address (on the bottom) and model number. After that, they needed our customer account information to link it, and it didn't take long to get it hooked up.We couldn't figur eout why it wouldn't connect.... until we found and resolved a second issue, which was the coaxial cables in our home being so old and worn they could barely carry a signal, so the modem wasn't seeing it. We got Comcast to lay new cables the next day, it took us 40 minutes and we were up! And we get a couple Mbps more up and down than we pay for, actually. (Thank you, ISP overprovisioning!) This hasn't disconnected us even once, aside from the times a Comcast van worked in the area, killed internet for everyone for a bit, and only told us so when we called them and confirmed the problem wasn't on our end. You know. Comcast. Whaddaya gonna do? Their speed plus outages, vs. AT&T slow-but-steadiness.This little machine works fine. But do not put it in your bedroom, or somewhere the light can bother anyone. Unless it is facing the wall. Give it some good air circulation (just the open air of your house will do), because it's pretty darn warm normally. And the lights, as I said, are quite bright in evening or night.All that aside, it works with Comcast, it's fast as promised, and should be able to carry us for what we hope will be years without needing to upgrade. We have not seen any slowdown or glitches from this thing yet, and if we're lucky we'll never have to.

After spending years with Verizon and tolerating endless rate hikes, the Rubicon was finally crossed when my bill went over $200 even with a single set top DVR for the whole house. I decided to switch to Comcast Xfinity using a promotion for new customers. Naturally, I did not want to pay a ridiculous modem rent of $10/month (recovered in less than a year for the top-of-the-line modem or in less than two years even with the purchase of the most sophisticated hybrid modem/router device).I started with a hybrid NETGEAR Nighthawk AC1900 modem/router, but the device's UI proved to be ultra-slow and complete junk. I immediately returned it and got this top-of-the-line Arris modem for Comcast (around $110), using the ASUS AC-68U as a router. The modem started working in no time, and after a very quick network auto-configuration it has reached the peak download/upload speeds provided by Xfinity Blast Internet. The combo works great after more than a month, and I am steadily getting speedtest.net measurements above 200 Mbps for downloads and around 12 Mbps for uploads (limited by Comcast). This exceeds top "promised" speeds of 200/10.No reboots required so far, after a month and a half. Speed measurements are steady, and 4K streaming from Amazon and Netflix simply flies without a hiccup. The same is true for video conferencing, file uploading and downloading (including uploading gigabytes of new photos).To summarize, this is my advice: If you have to get a modem for Comcast Xfinity or other such provider, just purchase the top-of-the-line Arris Surfboard for around $100 and use a separate 802.11ac-compatible router from a trusted, reliable brand like ASUS. Stay away from junk Netgear UI, and from combo devices in general...

Worked perfectly until cable company made it incompatible with there service

The signal to noise ratio on these reviews is unbelievable. I have no possible hope that my review could influence the overall score of this device, but I can tell you that if you are one of the lucky people who happen to stumble upon reading my review, please consider my review in the proper context. Part of my trade is a network engineer, but I do not want to bore anyone with technical details. I will try to explain things in terms that are very straightforward:Many cable modems are built with the same or similar components which are developed by chip manufacturers. This particular modem is built using a chip family made by Intel with the brand name "Puma" which is a low cost chip which integrates a lot of the hardware necessary to build a cable modem onto a single chip. Several manufacturers use these chips to build modems, and different models by the same manufacturer may use different vendors' chips. For the most part this is a good thing; the hardware cost is reduced and consumers can enjoy a better product with more consistent and reliable performance.Sometimes though this is not the case. Intel Puma chips have several severe problems which have not been addressed, and it is further unclear if the problems are even able to be addressed. The first problem is a security issue which allows anyone on the Internet to block your cable modem from sending or receiving traffic. The second is an issue where in certain common circumstances the cable modem will have problems sending or receiving data in a timely manner.Both of these problems can lead to temporary complete loss of service or can appear to simply be slow or unreliable service. Because people have come to expect that their home Internet service is occasionally slow and unreliable, these fundamental faults are often overlooked as trouble. Likewise certain types of testing which do not provoke the problems reveal a modem which appears to perform admirably in most circumstances, and so many are left with an overall favorable impression.I have no doubt that the people leaving good reviews about this modem are sincere; but I also have no doubt that they have experienced trouble and overlooked problems with their cable modem as problems with their connection or service provider. Sadly, answering the question regarding which alternate product one should purchase is equally difficult because it is highly dependent on your cable provider. It could be that a 24x8 Broadcom modem such as the Netgear CM600 is the best choice, but it could also be that a SB8200 DOCSIS 3.1 modem is the best choice. But there is one thing for sure: the SB6190 is to be avoided.