I am in a zone that has yet to be reached by FIOS, unless it became available when I wasn't paying attention.
DSL has been solid where I live. When a storm knocks the lines down, or we have a power outage, I'm out. But they put it back up relatively quickly. My gear has been solid, if unremarkable. When my DSL router died, they sent a tech out fairly quickly to diagnose the problem. I had to boost my cost by something like $2 a month to get a replacement DSL router, but it beats owning my own.
The people who answer the help line speak English. The screens they are loking at make them useful.
It's good enough for home usage. It might not be good enough to support a business. I'm basically in "why should I change" mode.
I started logging into Verizon's community forums for mutual support. BTW, their BBS user interface really sucks. Judging from the questions asked, there are people who have major recurrent problems with every area that I've judged satisfactory. Most of the problems have to do with the last mile. Or speed. Or both.
The alpha techies on the forum operate in a very old school, "tell me all you model numbers, and then I'll help you" mode. The people with the problems vary wildly, from people just coming up to speed with computer networking to people way more technical than I am, at least in this arena.
The most common recurring problem is people trying to find out how to put their DSL router (which they call a DSL modem) into "bridge mode".