Great Modem... works with Comcast !!
349160
This Modem only took minutes to install. Just activated it with Comcast & you are ready to go.
D/L , U/L Speed has improved.
I would recommend this Modem.
1062900
Very satisfied with this cable router/modem. Performs as advertised. I found 5G wireless performance especially good. Easy to setup, except for erxtended call to Comcast to complete 'activation'. This required multiple attempts by Comcast support (for no apparent reason). Device is on their list of supported/recommended products. Was advised by cable guy that this process only goes well if you buy or rent the device from Comcast (!).
393154
I ordered this from Amazon in September (for $129) and received it in November, for installation in my vacation home in Florida.  I just got down here this week and installed it on my Comcast internet service, replacing an older Motorola cable modem that couldn't handle the speeds now offered by Comcast.  The installation went flawlessly and took about 20 minutes.  I called Comcast's technical support, gave them the model number and MAC address, and connected it up.  It took Comcast about 10 minutes to make the changes and reboot the modem a couple of times, after which it worked like a charm.  I then upgraded my internet service to the "Blast" level, which is 50mbs download and 10mbs upload.  I'm getting near those speeds according to the speed tests on dslreports.com.

Please note that I have a Zywall USG 100 business class router with gigabit WAN and LAN ports, and I did the tests from a computer connected to the router via ethernet cable, not through wireless.  If you have lesser hardware, or attempt the tests from a computer connected via wireless, your results may not be as good even though the cable modem is capable of those speeds.

The only minor downside is that the blue lights on the cable modem are very bright and I have it sitting in the den which has a hide-a-bed and doubles as a third bedroom, which means that someone sleeping in that room is going to see those lights on all night.
808738
I am very happy to no longer be renting a modem from Comcast for $10/month, just wish I had done this sooner.  I did much research before buying and could not be happier with this CM600 modem from Netgear.  This modem either matches or exceeds the specifications of the Cisco modem provided by Comcast and does not have wifi which I neither needed or wanted in a modem.  I found the installation/boot-up to be very easy as it did not require a phone call to Comcast, just simply followed the instructions and it worked first time.  I ran a speed test before uninstalling Comcast's modem (using testmy.net) and after hooking up the CM600 and found no difference in download/upload speed.  Having said that, it seems to perform better/faster than the Comcast modem but maybe it's just my imagination.  It definitely does boot up faster after a power interruption as I am back online much quicker when that occurs.
The only complaint I have about this new modem is the power adapter is made so when you plug in to your surge protector it covers at least two additional outlets due to it's design.  The prongs need to be turned 90 degrees to prevent this which I solved by buying a "cube" at the hardware store and plugging it in first then the power adaptor on top.
The pluses to owning this modem are obviously that I am no longer needlessly giving away money to Comcast.  As well I am not letting Comcast use me as a "hotspot" or public wifi.  I had previously contacted them about this and followed their directions for "disabling" the wifi on their "gateway" modem but... after doing this their modem continues to transmit a signal further crowding our house with a unwanted wifi interference and disabled me from using the four Ethernet ports in the back of their Gateway modem for the devices I need to hard-wire.
I did have to buy a Netgear desktop switch GS105 to regain the ability to hard wire certain components and it works very well in conjunction with my Netgear modem and Netgear R7000 router.  Thanks.
1451232
Plugged it in, easy setup with Comcast, works fine. I chose this cable modem after reading the reviews on the others. I have been extremely satisfied so far. No hassles and no problems (knock on wood).
3939648
Comcast is my internet service provider and this modem installed so easily and efficiently.  Just plugged everything in and called them with my MAC ID and it was all set up within minutes. Arrived in an opened package but there was no sign of damage so it was basically new. I have used a few Motorola modems so I am familiar with this brand.  You definitely cannot go wrong!
3182238
Absolutely no issue with this unit at all!! The hardest part was call Comcast to get it activated which just involed waiting while the pressed their magic buttons.  My old modem was said to no longer be supported by Comcast even though it still worked fine. But hey, this one is a booming upgrade and works great.
1557201
It gets the job done as well as the much more expensive modems. It was the Time Warner version but Comcast worked fine with it. I called Comcast and they accepted the MAC address.  It took a little while for the modem to download the Comcast version of the software/firmware and then after a reboot it worked great. I got it used and for a 1/10 of the price of Comcast's "fancy" modem it works even better. I don't need the WiFi of the fancy one because I use a router that has a much better WiFi and firewall.
2496135
I ordered this to replace a Century Link Modem I was paying 6.95 a month to lease. I simply unplugged the old modem and plugged this one in and it works great !! I didn't have to configure anything !! I'm not saying this is typical of all century link customers but that was my experience. Highly recommend !!!
4854291
Got this about a month ago, and haven't had any problems. Haven't lost connection or anything. It works just fine. I got it for the comcast since they charge $7/month for equipment rent in my area. So I thought it would be best to simply purchase the modem myself, if I stay with Comcast longer. Comcast provides/uses this same exact modem.

For Comcast users, if in case you are thinking of purchasing this modem for comcast, then you should know that you do NOT need to install this modem to your computer. The only thing you will probably need to do is call the comcast customer service and provide the MAC number (found on the back of the modem) after connecting all the equipment. Hope that helps.
Researched before, and the previous reviews helped too, so just adding on to the other reviews.
554600
I've been using it for a few weeks since Comcast declared my previous modem EOL. No complaints. Its been working with no problems.
1954264
I had been using a purchased 3COM "Shark Fin" cable modem on my Comcast Internet service for 3-4 years.  In retrospect, it appears that as Comcast went through several "speed bumps", boosting download speed to 4Mbps and beyond in my area, the 3COM modem was having trouble keeping up.  Many modem disconnects and resynchs per day were an annoyance for me, but a disaster to my son, an online gamer.

I did a bit of web research on possible modem replacements, and found units from Motorola and Linksys generally rated most highly (or frequently).  Even though I'm a loyal Linksys router user, I went with the Motorola SB5120 because of its good reviews.  The unit has performed very well now in two months of service.  Reliability has been rock-solid (my son is back in the saddle with Halo2!), and download speed has gotten as high as 5.5Mbps, earning me a "Dude!" rating.
1946686
I bought this cable modem to replace Comcast Motorola Cable modem that I had leased from them. I took this out of the box , noted the MAC ID and gave Comcast a call and told them I want to put my own modem. They asked me to disconnect the old one and connect this. They immediately saw this modem and I connected to them. I rebooted by Linksys wireless router and my PC. I did have to register my modem again with Comcast online by putting my account number and vola! I was up and running in less than 10 minutes and to saving $7 a month for modem rental.

This is a great buy to save money for modem rental with Comcast. I highly recommend this and also I have noticed by connection is better and faster than the old one ...
3108366
Great modem that works wonderful for a friend of mine.  I would have used it myself, but didn't do my homework first to realize that Comcast cable has compatibility issues with it.
4891317
I received this modem today. I ordered it less then two days ago and here it is. My compliments to Amazon for this really fast delivery.

OK now down to the nitty gritty...

This modem is certinally worth the price. It has increased my speed and once it was set up it worked great. I even use VOIP telephone system (Magic Jack) and it seems to really make a difference.

Now for the downside. This modem came with firmware that was created in 2010 so it seemed to work well. I have read reports on this forum saying thet the firmware from 2009 caused a lot of connectivity problems but as I stated the current firmware works well once it is set up.

The modem is not "plug and play" as I was told by Comcast, but rather, you have to call Comcast and give them the MAC address as well as the serial number of the modem. They then remove your old modem and put this one on line.

This represented a problem for me because if I don't have internet service my VOIP telephones don't work. So, I tried calling Comcast on my cell phone and was put on hold for nearly a half hour. I finally decided to disconnect my new modem and reconnect my old modem. I was then able to call Comcast using my VOIP Magic Jack, but still had a fairly long wait until I was finally able to speak to a representitive. At least I wasn't burning up my minutes on my cell phone.

The representitive had to switch me to another representitive who put my MAC address and the modem serial numbers into their system, So I then disconnected my old modem and reconnected the WMB760A, let it boot up and all of the LED's turned green, and so far everything is working well including both of my Magic Jack phones.

The reason that I am only giving a four star rating is because the modem is not plug and play so you will probably have to go to your internet service provider and duke it out with them.

However after all is said and done, this modem (WBM760A) is certinally worth the price I paid and Amazon had a special. If you bought this modem then they were offering a TP-Link Router for only $22.00 and some change, so I bought both items.

*****So far no problems *****
4770715
I have been using this modem for almost 2 weeks and I can really say that it is AWESOME. Connecting it to my comcast service was easy. Just call their IT support and they will hook it up to their system. They basically need the MAC address.

I really gained some Mbps on this modem. I used to get 17Mbps and now I get up to 25Mbps on speakeasy or speedtest. Of course it all depends on the time of day you do the test but overall, it is worth every penny. It will pay for itself shortly... Luckily my neighborhood backbone is already DOCSIS 3.0 but still a MONOPOLY. I would like to test this router on FIOS...
2438155
I began to suspect that something was wrong with my network gear when my Skype calls kept failing.  I checked my internet download/upload speeds and found them at only 8mbps.  With a bit of Googling, I realized that the cable modem I was renting (for $7.50 a month) from Comcast was nine years old.

This modem was very high on the list of Comcast-approved modems and the online reviews were very good.

I ordered the modem (great price;) got it in a couple of days(great service,)plugged it in (simple as can be,) and called Comcast to let them know to update their settings to the new modem and BAM -- 35mbps download speed.  This is a very, VERY good modem.