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If your download speed tier is under 200 MBps, then I don't see any need to as long as the modem is working fine.
If you do need to upgrade, since you already have a new Linksys router you may be better off buying an eMTA modem like the Netgear CM500V, and it'll pay for itself in a year by saving you modem rental fees.
OP. Just as a FWIW, I always advise posters to stay far far away from those combo gateway devices !! Just look around the forums and you'll see that there are boatloads of issues with them.
There is always an inherent disadvantage with these. Combo gateway devices are always a compromise in both quality and performance compared to separate units. Also, only the ISP can update the firmware so you are always a prisoner of that / them. And the firmware is typically crippled by the ISP's customizing of it and they typically eliminate valuable features.
One of the biggest issues with them is that it is far more difficult to diagnose connectivity issues when it comes to troubleshooting. You can't narrow things down by using the process of elimination by removing just the router from the path. And if either segment fails / malfunctions, you have a total failure. I think that CC made a big mistake when they changed their policy and decided to start supplying them instead of dedicated devices. The suits seem to think that this will save them money for support costs but I think that they are getting far more support calls/complaints than ever... We certainly are seeing far more complaints in forums now !
Another issue is that Comcast has created a publicly accessible 'xfinitiwifi' link on their gateways. It supposedly uses separate bandwidth from your own. You can disable it from a link on the Comcast site, but people have been posting that it keeps turning itself back on every day.
Get separate units and keep the control of your home network in your hands instead of theirs, you'll be much happier !
Thanks for the insight, EG. I thought I remembered some people advising to not go with the gateway, but no longer had the source. The reason I asked my question was because when looking at my Comcast acct., there was a message that I needed to update my modem, and the only choice they offered was the wireless gateway. So the message from cc was misleading. Thanks again.
Quite welcome !