Sound quality is great. The cushioning is tough on the ears after 30min or more of use for me. I wish I would have gone with over the ear instead of on the ear.UPDATE: 04/2016I been using these headphones on and off for the last year. I've REALLY tried to like them, but sadly I regret getting them. I've already mentioned that they start to feel uncomfortable and irritating after a few minutes of use. I wish Sennheiser would have used thicker padding or something for these on-ear's. The headphones sit tightly around your head, which is fine, but I think it adds to the discomfort after a short amount of time.To be fair, this is my first experience with on-ear headphones and I don't know if this is the general design.Finally, I can no longer overlook the cable design. The quality of the cable is great, I don't see them being damaged at all by any normal use. However, the microphone/volume button feels clunky and weird to use. I can't easily adjust the volume or push the talk button without feeling around and thinking "Is this the right button?". The way the buttons are placed, you can easily press two buttons at the time, and I usually do. That whole button/control designed is not intuitive. Also, the L-shape plug doesn't work as well now that I'm using a case that surrounds the boarder of my iPhone 5. While true, I can remove the case and not have this issue, but if it had a straight plug-in, this wouldn't have been a problem. If given the choice to use either my headphones or a case, I would choose the case and ditch the cans.If it wasn't for the experience I've had with the headphone cable, I would have considered getting the over-ear version.Pros:-Great sound quality-Build quality-Headphone design (Minus the ear cups)Cons:-Uncomfortable after a short amount of time-Microphone/Volume button is awkward to use.