The XM4s were horrible in the comfort dept, after about an hour I'd be uncomfortable enough to label them as mildly painful. The bluetooth was crap also, at least on PC where I had all sorts of issues. But the sound and ANC were incredible, it's a shame. Seems like they upped the comfort on the XM5s at least. I'd be tempted to give them a shot, but the lack of any kind of low latency mode Achilles heels them for PC use IMO. Gaming, YouTube, etc on a PC were terrible on the XM4s due to the bluetooth lag.