I have a case coming tomorrow along with a car mount. One issue that I'm having is that the buttons are extremely sensitive so I find myself accidentally hitting the side buttons when I don't mean too. Also with so little bezel I accidentally launch programs and touch the screen when I don't expect to. A case should fix both of those.
Yesterday and this morning were my first days at the gym with it. I'm not sure why, but it rebooted 3 times while using my bluetooth headphones. At first I thought it just randomly crashed but then I noticed that having it sit on its side on the treadmill was holding down the power button and I think a combination of that and me swiping on the device caused it to reboot. Again, hoping a case will fix those sensitive buttons. Using bluetooth receiver in my car has been flawless so far.
I haven't tried root yet. I figure I'll let it shake out before trying. There's currently no 527m on ebay.
So far not bad. If there is a bluetooth issue I'll have to resell it though as that'll piss me off.
EDIT: BTW, after I put an SDcard in and it moved my gallery there, the gallery app is smooth.