I LOVE these headphones. I work as a medical transcriptionist, and I use them for work as well as for listening to music, watching videos on my computer, and just about anything else that I want headphones for. Sound Quality The sound quality out of these Bose headphones is amazing. It sounds like you are right there in the music. When I use them for work, I have no trouble distinguishing the speaker from the background noise, which is a problem I have had with "regular" headphones. Comfort These headphones are very comfortable. I wear them for hours at a time, and other than a little spot of flat hair on the top of my head (which happens with ALL over-the-head headphones), I have no problems. The ear covers are very soft, and there is a padded part at the top of the head. They are adjustable, so now matter how small or large your head is, you can get these to fit. The adjusters work great too, no loosening at all. Design I like the design of these headphones. They cover the entire ear, which is pretty good noise cancelling, but they aren't huge and bulky. I would probably not use them while exercising as the ear pads would get sweaty and eventually that would be pretty gross, but they are great for anything else. Durability I've had these headphones for years, and other than a little of the ear pad covering coming off, I've never had even the slightest problem after what I would call very heavy use.