Love my QC35, extremely comfortable with pleasing (not best) audio quality and excellent noise cancellation. As others have said, I do wish there was a toggle for the noise cancellation feature when using it wirelessly as sometimes I don't need/want to drown out outside noises (I have little kids so can't use the headphones when "babysitting"). Hasn't stopped me enjoying the headphones though.
My previous wireless headphones were the sennheiser mm550x, which were nice and compact for a pair of noise cancelling headphones, but they were pretty tight on my head and got uncomfortable after about 30 mins, as well as choppy audio quality and decreased fidelity when ANC was turned on.
I find the battery widget somewhat useful, but with the excellent battery life, and the fact that it announces the approximate (to the nearest 10%) battery life when your turn it on, the widget is kinda redundant.
IMO, they are one of the finest wireless headphones that I've tried and quite possibly the best wireless ANC headphones at the moment so you can't really go wrong (if money isn't an object, that is).