I recently went through an install of xfinity/comcast.
They provided the xFi modem/router. It worked fine, but had a few drawbacks. First, $14 a month ($168 a year). Second, it’s WIFI coverage wasn’t very good. Third, their firmware does not let you override the router’s default DNS address, which for me, is a big problem as I use a piHole ad-blocker.
I guess another drawback is that it has an integral power supply, and you cannot substitute your own. FWIW, I am very skeptical that a LPS would make any difference whatsoever. Not trying to start a fight, but an LPS will not change the delivery of bits to their destination. If you’re one that is convinced that electronic noise from your network is a problem, you’ve already isolated your streamer/dac from that with the ReGen and fiber optic.
I returned the xFi and bought a Netgear modem and router (separates!). At first I wasn’t getting the speed with the new setup that I was previously, but phone call to to xfinity solved that. Their very competent and pleasant phone tech said that it was very common for customers to replace their modem/routers.