In my state, their coverage is pretty bad if you spend any time in the outdoors. Comparing the coverage of google-fi and verzion and att on highways through the mountains, its very stark. I'm also curious how they will fare when 2 of their 3 MVNO providers merge (sprint and tmobile)
Eventually service will improve. Presently Sprint and T-Mobile both dedicate spectrum to the same thing. They have to reserve some spectrum for legacy applications while optimizing for newer technologies. By combining their spectrum they might be able to reduce the aggregate spectrum necessary for legacy applications and better utilize spectrum fro newer technologies.
It might help with coverage as they aren’t needing 2x as many towers to cover the same area, thus potentially justifying adding towers in new places, but I wouldn’t hold my breath on that happening in any broad way.
Meanwhile, my work phone on AT&T has some of the worst LTE coverage imaginable around town in the bay area - constantly without a meaningful data connection - while my wife's identical phone on Google Fi is almost never below fell bars, and her data connection is rock solid.
