would this be a good choice for a modem only device for comcast service? is there something better ?
It's on the list of Approved Xfinity Modems and Gateways so if you're on a 250 Mbps download tier or lower, without voice service, you should be fine.
Great info sorry took a while to get back you, I pay for blast service which is 250 or over. I am gathering i should look at a different model, any idea if Comcast will be moving to faster service in future? no sense to by an outdated piece of equipment. what would i be looking for as my son does gaming and i have no clue
There are faster speed tiers that Comcast offers, (I have their Gigabit tier for instance) but 250 Mbps is pretty good for vast majority of users. For online gaming, the speed isn't as important as the latency (or lag), and honestly, Xfinity Internet more than fast enough to allow online gaming.
If you're concerned about whether you have enough speed, you can use this pretty nifty online bandwidth calculator to see if your service tier is sufficient for your needs. If you then determine you need faster speed, you can then browse https://mydeviceinfo.xfinity.com to see what modems you can use.