I have Google Fi, cheap as shit, good service where I am.
I also have Project Fi. I pay about $40 a month with tax. The service uses Sprint, T-Mobile and U.S. Cellular. I have a Nexus 5X 32GB. The service is very good, I would say arguably second to only Verizon and honestly I've had service in a few areas where Verizon didn't. Namely where I work Sprint is the only provider that has coverage and not Verizon, so Project Fi wins out for me.
If you travel abroad Google has agreements with foreign providers. I went to Italy twice last year, the first time I had to buy a local SIM to have service which was very annoying. The second time I had Project Fi service. It worked FLAWLESSLY. I even had service on all of the small islands surrounding Venice. So technically there was no charge for data. Their data rates are the same when you are overseas. So basically my domestic data dropped to say 1.0gb from 1.5 gb and my international went up to 500mb because they charge the same rate I saw no change in my bill.
Also, you can get the app "Signal Spy" and switch to whichever of the 3 services you prefer if you do not think Google's autoswitching is working properly. (I only do it at work).
5 former Verizon customers at my job now have Project Fi for service.....that says a lot about it.
