Initially bought the 830 (silver/green) from Fido in Canada, but couldn't get it unlocked so it ended up being returned. Backlight bleeding at the bottom of the display was visible. Didn't seem like there was a gap, but it was not pleasant to look like. I replaced this with a black 830 from TELUS, which doesn't have the issue. The Glance Peek feature is useless if tying to activate via hand gesture. Annoying noise when placed on my 3rd party Qi plates (but not on my DT-910).
I'm getting ready to throw this thing as fast as I can at my nearest brick wall. I'm getting random reboots. At first, I thought that it may be due to restoring from a previous backup file (which was dragged through multiple devices and OS versions, including some Dev Previews). So I did a hard reset and set it up as a fresh device. No luck. It just keeps happening at random intervals. It's particularly annoying to be in the middle of a tracked bike ride to have this happen, terminating my workout session.
Why is Nokia/Microsoft seemingly incapable of releasing good hardware without bugs? I've had so many issues with the 920/928/1020, but ZERO problems with the 520/620/635. I've briefly had the Icon, which I'll admit was problem free, but I really wanted my Glance screen back.