1. Lack of SD Card slot. This would have been a deal breaker, except I really wanted to try Fi. It still irritates the hell out of me.
2. No IR Blaster. Absurd.
I've had Fi for a month in MI. Mostly in the Ann Arbor to Dearborn areas. It's been perfect. The plan was to move it to Verizon if Fi didn't work out. So far, so good.