So a couple of weeks in with the 5x on Fi, the service is awesome and I'm glad I switched. But the battery life of the phone is pretty mediocre. I can do nothing but surf the web for 30-45 minutes and see it drop by 5% or more, and it'll regularly be down to 55-65% (sometimes even lower) at bedtime after a day of light usage--a couple hours listening to podcasts, a few phone calls, but nothing severe and not much screen on time. That's even after shutting off the stupid "OK Google" always listening junk, the constant traffic/sports/news/etc card updates, and a lot of other stuff that was sucking battery.
I basically can't imagine taking even just a weekend trip with this phone without having to drag along a charger, which sucks.
OTOH, the pricing is as great as advertised, and the wifi calling is fantastic--there are a few underground locations with wifi access that I've had no problem making calls from, where Verizon and AT&T aren't available. And the OTA updates are completely on point.