I've used my own Arris modems with Comcast/Xfinity since 2014. They work fine. If there is a problem, Xfinity will say it's your modem every time. So far, it's never been the modem - instead an Xfinity service problem that is solved on their end within some period of time. If you need tech onsite, they might charge for that. I've spent $325 on 3 modems 7 years (I like to keep them up to date), so even with a tech charge, I would be many $$ ahead. Currently using an SB8200. No GL, no LPS.
Improving Comcast modem signal
Our internet service is Xfinity/Comcast or Verizon. Currently I have Comcast service and use their modem because I had trouble with Netgear modem compatibility with Comcast. The problem is that the Comcast modem doesn’t allow LPS. I don’t know about the Verizon modem. So, for people with modem tweaking experience, any suggestions that will make a notable improvement?
The modem is connected via house Ethernet cable to EtherRegen in my listening room, which is connected to Lumin X1 streamer via fiber optic listening room.