Customer Ratings & Reviews

For the first 5 days the CM1000 was great. Installation was completely done on line with no call to Xfinity needed. Have Comcast/Xfinity 200 and was getting 237 down with ping ranging from 10 to 13 with this modem. On the 6th day modem lost connection, do to sync issues with Comcast. The only way to reconnect was to power down and restart the CM1000 modem. This has happened once a day for the past 3 days. Returned unit to Best Buy, before the15 day return limit expired and bought the SB6190. I will wait for a year or so for the 3.1 problems to be worked out.

Why would you not include the coax cable that you need to make this work? Makes no sense.

it does exactly what it claims to do. I am a happy camper :)

I returned the modem because of constant T3 & T4 errors in the log. I had Comcast checking my signals which were perfect, but we could never identify the problem. Basically, at least twice a day my connection would drop from Comcast in Tennessee and it wouldn't come back up until the Modem was manually power cycled. I returned after a few days and bought the SB6190 and haven't had a single issue on the same coax and splitter. I would say this modem is overly sensitive to interference. Perhaps that can be resolved with firmware, but currently as of 1/18/17 I would NOT purchase this modem.

I work from home, and bought the CM1000 in June 2017 expecting a top-of-the-line, worry-free, dependable product, for a top of the line price. It's now Feb 2018 and the modem has apparently failed. I say apparently, because I cannot get NetGear tech support because I'm outside my 90-day window, and not going to spend another $50 for their premium support. I probably should have bought the BestBuy replacement plan at time of purchase, but didn't. Win some, lose some. So while my support experience may be self-inflicted, NetGear really should be producing products that reliably function for more than a year. I hope my product experience was a fluke.

performs great if it's operational, however mine just crapped out after 2 years. and tech support from Netgear costs money. what a racket.

Upgrading to a 3.1 modem to get 500 speed and thought I would give Netgear a try this time. My previous modem is an Arris and I've never had issues. Well, I contacted Medicom today to activate and after many attempts, they couldn't get the modem to be online on their end. I was told that it could be a defective modem and that I should replace it and they could try again. I'm going to replace it, but going back to an Arris 3.1 instead.

I have had this modem for a year ,a few months back there was a huge firmware update for the cm1000 and a nighthawk router I own . As soon as I updated both, vudu started acting up . I kept getting errors on vudu I could no longer stream a movie with out trying multiple times . I went out and got a new router I still could not stream vudu with the router setup right . I then went out and got the new arries modem for 3.1 and wow my problem was solved. I can stream vudu now I wish I would of waited for the arries to be in stores.

I read the reviews of the Netgear CM1000 on the Best Buy website and looked carefully at the product packaging at my local Best Buy which clearly indicated that this modem was compatible with Xfinity. As soon as I got home and hooked it up, the modem couldn't see the Internet; I called Netgear and was told I had to call Comcast to give them the MAC number (which a number of people indicated they didn't have to do and the instructions suggested wouldn't have to be done, as it was self-authenticating). I was then told by the Comcast representative that Comcast didn't support DOCSIS 3.1. So, I'm sure this is a fine modem, but I'll never find out as I have to return it to Best Buy for a refund and get an older, slower modem. It would be nice if Best Buy and Netgear would have verified that this model works with Comcast nationwide or bother advertising one in an area that doesn't support it.

This product does not work with Comcast even though it is "Comcast certified" by Netgear and recommended by Best Buy. The modem will pull the incorrect Comcast Deployed firmware version even after a factory reset with proper firmware sent from Comcast. I have spent loads of time and money buying additional support sessions with Netgear in order to try and get a solution. Troubleshooting this with Comcast and Netgear has taken months and months of frustration and dealing with inconsistent performance. In trying to save money by using my own modem with Comcast I have spent loads more.

The modem suddenly stopped working in under 60 days. I spent hours on the phone trying to explain to them that it was just constantly rebooting and was not functional, but they weren't having it. They tried to make me pay to ship it to them, and said they would send one to me within 10 days. Garbage, I replaced it with a motorola and will never buy another piece of hardware from Netgear again

Mine died two weeks after the warranty ended. Now I have a $170 paper weight. The modem acts like it’s connecting, but provides, at best 5Mb down (I should be getting 1Gb). Most of the time I get no fat at all or .25Mb down. Comcast tech confirmed problem is the modem. This is literally the third Netgear product in as many years that has stopped working for me. I’m done with their products.

Bought this for my Comcast Cable connection with the plan to upgrade to the 1Gbps. The modem had trouble staying up when only connected at 150mbps. Put my old Zoom Docsis 3.0 modem back and am going to return this one. Its not stable and suffers the usual netgear power cycle bs. You think they would be able to fix that by now.

I bought this model specifically because it said it would be compatible with future Xfinity upgrades and less than a year later Xfinity tells me it's no longer compatible and i should buy a newer model. Scam

Bought it 2 years, and Woke up this morning to no internet. Check the modem and notice that all the led’s where blinking rapidly. No troubleshooting or info on this issue from netgear

Purchased this modem for my Suddenlink gigabit internet service, but the modem did not work at all. I got less than 1 mbps speed with a 133 ms ping speed. Even though Suddenlink confirmed this modem was compatible with their service, it did not work and I had to return it.

Started having random internet disconnects that required restarting the modem. Tried to contact NetGear support, they charge you to talk to someone and it's 10 days past my 1 year warranty.

idk why but this mest everything up and wasted 4hrs of my time. it would not activate. so i tryed activating my old one then that dident work. so i been on the phone trying to activate the old one with my isp

Not compatible with Wave Broadband Gigabit internet. Paid for the modem and shipping, scheduled installation of our Wave Gigabit service, this modem would not transmit a signal. Had to buy an alternative.

Stopped working after a day. It also bricked my router.