Let's see how it turns out...
I switched from AT&T and iPhone 5 to T-Mobile and HTC M8 about 2 months ago, so far so good.
My biggest complaint about Apple is their shitty ass lightning cables. Can't believe they allowed those into production.
Read the reviews:
http://store.apple.com/us/reviews/MD...&rs=mostUseful
Plus, the battery got old so the phone started dying at 40% charge. It was time for a change.