I also have it. For the few years I've had it, I haven't had major issues. Only downfall is not being able to put your router/gateway into a true bridge mode if you want to run your own wireless router. What I did though, was buy an Orbi mesh network and haven't had issues. I actually keep my main/important/higher priority devices on my mesh network, keep normal every day devices on the 5ghz main router network, and lower priority or guests on the lower/guest network.
I also have better experience and less issues with fiber than I did when I had any other internet service from anybody else. Plus, $70/month (flat) for gig service and no "monthly device rental" is great.