I tried the Sennheisers at an Apple store in the UK a few days ago when over for a friend's wedding. Just as a prerequisite and another reason why I rarely if ever am interested in Apple products, the store clerk had no idea what any of the specifications of the headphone was, yet still seemed to think it was clever to guess and sound informed. Most of the time he guessed wrong. Anyway, the comfort on the Momentums was the only reason for trying them out as that is the most polarizing and controversial aspect to them. I knew the sound was going to be impressive, and it was, but the comfort, that's an interesting discussion.
These are not 'around the ear' headphones despite their moniker and the actual 'on-ear' version. They are planted firmly ON TOP of my ears and stay there. I don't know anyone with ears small enough for these earcups, but maybe they're out there. Despite this, however, they are not uncomfortable, seal surprisingly well and feel relatively secure. The isolation is excellent for an 'on-ear' headphone and the pads are warm, soft and breathable. The clamping force was pretty much perfect, and the lightness meant they never felt obtrusive. This was a surprise and they are back on my radar as a potential purchase. I do have the Sony MDR-1R's for portable use, though, so I probably won't bother with them as I usually only wear IEM's when out and about. For home use such as gaming, listening to music, and watching movies, I have my AKG K550's, and I'm happy with them.
That were very sturdy, lightweight, sounded balanced and didn't have the overt thickness of the Sony's or the slightly lacklustre bass of the K550's. I liked them a lot, but I don't know how they would fare for long periods of listening at home where I mostly use headphones. I think I can do without them, to be honest.
