Cell Phone, Project Fi

I need a whole new plan and phone. Has anyone here used Google Project Fi? It seems pretty legit at a glance. $20/mo + data at $10/GB, no contract, and Nexus Phones.

 

What towers do they use?

 

Fi uses sprint, tmo, and us cellular and the phone switches dynamically to whichever network is the strongest where you are.

 

Here is a review that's interesting.

http://www.computerworld.com/article/3056595/mobile-wireless/project-fi.html

 

He makes it sound pretty good.