Before going out and buying a modem, I would strongly recommend making sure through support that the modem you're planning on getting is ALSO compatible with the very specific data plans for now and for the foreseeable future. One of the interesting things I found was that the Comcast device compatibility site listed a modem I bought as compatible, but you can still wind up unable to get the speeds you're paying for because the specific profile that was listed for my account was not flagged for that modem even though the modem is actually capable of it (300/35 plan, which is a bit unusual). So I wound up returning my 24-channel DOCSIS 3.0 modem and buying a more expensive one on DOCSIS 3.1. The other option was to actually downgrade my plan to maybe 150 Mbps.