So far so good. Phone arrived late yesterday, and I really didn't start tinkering until today. It feels fantastic in hand and looks so much slimmer than I expected it to look. I had only seen one in person at the T-Mobile store, and it had the security device & wire attached to the back. So, I was pretty concerned the thickness would be awful. Everything is working w/o a problem so far, though I haven't had a chance to try out the Bluetooth yet.
I'm impressed w/ battery life so far too. I've had screen on time of over 5 hours while I set the phone up, transferred files from my prior phone and my laptop, put together a Nova launcher look that I like for the time being, etc and I still had around 50% battery left.
EDIT: 2nd day of usage. I finally got around to trying Bluetooth. I used it with a wireless speaker I have for music at home. It worked perfectly. I have a small house & the speaker is roughly in the center of it, but I went into several rooms with a furthest distance of maybe +/- 30ft...some with walls between and it did not lose the signal.
Also as a battery follow-up. Today was a low usage day (about 45 minutes of onscreen time), but currently it is at 8.5 hrs of battery usage, & I still have 83% of battery remaining (This is w/ GPS, NFC, WiFi & Bluetooth turned on.)