Motorola SB6141 DOCSIS 3.0 Cable Modem

*** 2-Year Update *** Well, after two years of using this product and a number of unexplained service outages, Comcast Tier 3 support and I finally determined that this modem is the culprit, and not Comcast internet. We don't know exactly what the issue is, but the modem keeps hanging (requiring a reset) whenever large amounts of traffic are thrown at it. For instance, I could easily and reliably cause the modem to hang by simply running two or three Comcast SpeedTest tests. I had some extremely important high-bandwidth video presentations over the last two weeks, and I found that the modem was hanging about once per hour. A very serious reliability problem that caused my presentations to look anything but smooth to my customers. So, I did a little research and found that there are a number of people complaining about this very same intermittent failure (just look at the other Amazon one-star reviews and you'll see a pattern). This modem either has a serious firmware problem (that has not been addressed via Comcast's regular updates) or it has an inherent hardware problem. All I know is that it didn't work under duress. A modem does one thing, and one thing only. And, apparently, the Arris SB6141 doesn't do it very well, much to my chagrin. I've since replaced this modem with a Zoom 8X4 modem -- which is in the same performance class as this modem, i.e., eight channels, and capable of handling connections exceeding 200 Mbps in bandwidth). The Zoom modem not only hasn't failed, but the methods that I used to reliably cause the Arris modem to fail simply don't have the same effect on the Zoom. So far, the Zoom has been utterly reliable -- and it came in at half the price of the Arris. Getting the Zoom 8X4 modem installed and operational with Comcast took, literally, less than five minutes from unpacking to operational network. I originally bought Arris because of their association with Motorola, but I have now lost confidence in their products. Look at the Zoom instead. BTW, I have an extra Arris SB6141 for sale for a really great price, if you are interested. =============== I got this modem at the suggestion of Comcast in order to move away from their standard cable modem and router configuration ($10 per month and unable to use wi-fi at higher bandwidth subscription rate -- it's a long story). The device arrived in one day from my order. I called Comcast tech support and informed the technician that I was going to replace their modem with my own Moto Surfboard 6141. Her first comment was, "That's a great modem!" Then, she proceeded to perform her configuration activities and instructed me when to install the modem. Once the modem was powered on, it configured properly from Comcast configuration manager, and it was fully operational. No fuss, no muss, and very professional (American) staff. Five minutes, and no hassle, so it was an excellent purchase from that perspective. What I didn't realize was that this modem actually transmits on twice as many channels as the Technicolor modem it replaced (communications channels, not television channels). This means that it is designed to operate at twice the bandwidth as the modem it replaced. So, I performed a SpeedTest on it and, sure enough, I was able to get to 120Mbps download rates -- WOW! My previous modem was only able to get to about 45Mbps. So, now I'm able to take full advantage of the bandwidth I'm paying Comcast for. This was one of those purchases that was so good, so easy, and the configuration so seamless and painless, that I can't recommend it more highly. Absolutely fantastic purchase that delivered far beyond my initial expectations, both in performance and in how Comcast would work with the device. Five stars.