I was going to wait to the end of the 14 day return period but my 7+ has become unusable, randomly from LTE to 1x even while walking in the city. I'm going back to my 6S+ now and the 7+ is going back to Apple.
Hopefully there is a fix for this issue by the time the SIM-free version comes out.
Hopefully there is a fix for this issue by the time the SIM-free version comes out.