I've got about 1200 hours on my Bose, mostly rattling around in S300s, but some time in JRs, as well as a variety of planks (even once in a B757 where I was at the nexus of a lot of noise - that got some strange looks). Mine were the old-style (9V battery), at about 200 hours I purchased the upgrade to the new style controls, which replaced the mike, cables, and control box, so 900 or so hours on the current setup.
I've had zero problems with the Bose. I generally do not leave them in the aircraft - if I do, I make sure they are out of the sun. Doors-off, winter cold (-25C) summer hot (35C), no issues as long as I have the headstrap adjusted well - if it is too "big", turning my head lets excess noise in and freaks out the ANR. I also usually don't wear glasses, although when I do, it's fine.