For regular phone use, this seems like a worse version of Google Fi; granted, it supports more devices. Data is $3 more expensive per GB, and Sprint is your only option, vs Sprint or TMobile with Fi.
Google fi turns me off because it seems to somehow be related to google voice.
I turned on a google voice number like 7 years ago, and used it essentially as a spamcatch. I still want google voice for something things (and would happily pay a few bucks a month for it if I needed to).
But I want google voice nowhere near my actual cell phone. I could decline to attach my cellphone to my GV number, but that means getting rid of my GV number, which still isn't something I want to do.
Someone fill me in if I'm missing something.