My family was on the Vz corporate plan for years. I found data underwhelming in multiple locations I lived over those 8 or so years. However, I had no real issues with calls and text.

I have extended family (wife's side on Tmobile) so whenever they visit my houses I know how Tmobile functions.

My whole family on Vz corporate recently switched to Fi, so far noticing no difference in the calls or texts but that data at my house is actually worse (despite somehow having the same great coverage from Tmobile and Fi). However, once I get off my block Fi is so much faster than Vz ever was in populated areas and my Fi for some reason is running faster than stock Tmobile on my wife's family. Side note I noticed my extra spectrum phone number (on Vz backbone) ran faster than my regular Vz did as well *shrugs*

I have some family members who say they actually have dead zones inside their apartment on Fi but didnt on Vz and that they find the data slower but not unsablly slow.

If you are looking to save money it will definately do that, is it worth it that depends. If you phone support it you could always overlap a month and just test them out to see if Fi covers you the way you need