I've found the device switching finally performs like the 'magic' that was promised! Adaptive mode has been pretty disappointing for me, I find that it allows in a lot more background noise than I'd like; I find myself just using Noise Cancellation most of the time still.

As far as bugs go, there have been more than a couple times where my headphones will disconnect temporarily and then reconnect for seemingly no reason. Battery life hasn't seemed to be very impacted so far!