Works well. Bought this for my Xfinity home wi-fi so I didn't have to rent one from them, this is totally worth it, it has a high speed low range setting, and a long range medium speed setting, after 2 months haven't had one problem. 10/10 would buy again if this one lights on fireI just signed up with Comcast and this modem works great with their service. I initially experienced some difficulty getting my internet to work but eventually figured out that I had to reset my Apple AirPort Time Capsule.As others have commented, the lights on this modem are ridiculously bright and I reluctantly docked it a star because of that. I assume I'll eventually have to relocate the modem if somebody needs to sleep in the spare bedroom where I keep it.his cable modem offers 32 downstream 'channels' and 8 upstream channels. Your download info gets spread over 32 'lanes' and your upload data gets spread over 8. Like lanes in a road, not enough of them coupled with heavy traffic can result in erratic performance and loss of quality of service.You share your local loop / node with other people in your neighborhood, and perhaps other neighborhoods if you live in a rural area. What this means is that your data and everyone else's is on a single shared medium, split up into these 'channels'. Your cable company will 'provision' or tell your modem which ones to use. 32 is realistically as high as they're going to go with this technology. Many areas already support 16 or 32. All will go to 32 before too much longer.Most customer owned/retail modems support 4x4 or at best 8x4. That means that you're cut out of using 28 or 24 download 'lanes' and up to 4 upload lanes. The modem doesn't jump around if your lane gets clogged up, you're stuck with the ones originally provisioned to the modem when it boots.The technology used has an acronym called "docsis" which handles modem/network management, encoding of your data, and channel handling among other things. Docsis 2.0 is an old end-of-life technology that has minimal management ability, cant use lots of channels and it takes separate resources for the cable company to provide you service, which makes their costs higher, which makes your costs higher. Docsis 3.0 is the current tech and what this modem supports. It allows the cable company to remotely identify problems with your equipment and correct it, and allows them to look at whats happening when you call them. It supports bazoodles of channels and offers excellent speeds and smooth quality of service.Modems are rated for total speed which is based on channels, however this 'ideal performance' figure is rarely ever seen even in standard lab conditions, let alone on the 25 year old cable in your house and to the connection at the street. These speeds also presume a completely uncongested network with nobody else using it and the full complement of channels the modem supports. You won't be getting any of that.Will this make your 50Mb/s connection go faster? I wouldn't count on it but many people report getting higher than their paid-for rate with a higher channel modem when their area is provisioned for high channel counts. What it'll do is give you a better shot at always having 50Mb/s and keeping your 'ping' times, gaming response times and netflix video quality consistent.The Arris modem is also the stock rental modem most ISP's use, so they're familiar with it. You can save a few bucks with different brands, but be prepared for more problems on activation and during problem situations.Many ISP's have "end of life"d modems with docsis 2.0 and 4/8 download channel modems although they're allowing retail/owned modems to continue being used, even though it creates problems for them and those customers aren't getting always getting the most out of their service.Docsis 3.1 will eventually show up next year and offer even better speeds, performance and manageability but these high tier docsis 3.0 modems will continue to remain in service for quite some time, perhaps 4 or even 5 years. When you're looking at renting a modem for $70-100+ a year, its a no-brainer to buy one. Unless you're subscribing to extremely high bandwidth services (400+Mb/s) you can get away with an SB6183 for a little less but I'm not sure that's a favorable economy since you'll be saving less than a buck a month over the life of the modem.I looked hard at the Netgear CM600 and the SB6183 and decided to go with the 6190. I bought an SB6141 a little over 3 years ago and its still offering me fine service. However my area (which is a little rural on the edge of the suburbs) has been set up for 32/8 channel support and I'm seeing my speeds and quality getting a bit rough especially in the evenings. One of my friends just upped their service to a high tier and got an SB6190, so now I have modem envy.I'm looking forward to the same experience as when I went from a 6121 (4x4) to the 6141 (8x4), which was an immediately measurable and noticeable improvement in consistency and quality of service.This modem, like many others, was a little mature upon its initial release late last year and it takes ISP's a while to process firmware updates and make them available. So while earlier reviews have had some legitimate complaints, the modem is now pretty solid on Comcast and most other providers.I'll update the review with some numbers once I have it installed. I thought I'd give the benefit of my research on this to save others time. Frequently modem choices get limited to "but what I have now works" (similar argument made for horses when cars came out) or "but I only have 75Mb/s service and my 5 year old modem will do 120 under ideal conditions" (my steam engine will get my car to 70MPH eventually"). Its a little more involved than that.

I got so tired of replacing modems and wi-fi routers every year with Comcast. They have a list of approved modems and end-of life modems and routers which you should check before purchasing. So I purchased this one since it was on their approved list this year (Aug 2016). Replaces 2 units-Cable modem and Wi-Fi Router combined into one unit! Easy to setup but does require following the instructions carefully. Wish the user interface on the ARRIS website and the IP Address was more intuitive and user friendly. This unit is bigger than most average modems so you will need space to allow for sufficient venting around. Its atleast the size of a nice hardbound 250 page book. The Initial setup took longer so be patient when you first power it on. Comcast or Xfinity will take about 5 minutes or longer to activate it (or reset the modem after you plug it in).The network name defaults to SBG6900- it is not easy to figure out which menu item to use to rename your network to something that is meaningful to you. Be sure to set up the guest network with a password btw since by default the guest access is not secured after setup.There are specific instructionsHave to wait and see how it performs over the next 90-120 days.

I am going to give this 5 stars so far but may change my review after some time. Of course the packaging was perfect and Amazon delivered this in one day.I am not a high tech person but I do get some things, at least I think I do. I have Cox internet and pay for the preferred account. I had a 4 X 4 modem for years and what I never knew was that I wasn't using the full capabilities of what I was paying for. So, in laymen's terms, here's what I learned. Please feel free to correct me.Cable internet comes into your neighborhood area and is shared by your neighbors. It's like a superhighway with lots of lanes each having the ability of cars speeding down it at high speeds. Your modem, depending on whether it is a 4X4, like my old one or this one which is a 16 X 4 (you can get higher than that) allows you to use multiple lanes. The first number is the download speed and the second is the upload. So instead of being able to use only 4 lanes, I get 16 lanes. My upload didn't change. This allows me to use the lane in which there is less traffic. This is at least how I understand this all.So, just to prove my point, on my great 4X4 modem, I was getting 70 mbps download and 12-13 upload speeds. With this, I got 174 mbps download and the same 12-13 upload. I might be wishing I have the higher upload speeds because I use cloud computing all the time.Also this has a built in router which I love. I had a pretty good router but decided to buy the combo. I might be wishing I stuck with my router and bought the higher speed. At least this way I don't have to worry about compatibility or any wires issues. The real trick will be if we can access the internet at the other end of the house.