I use these Philips headphones primarily for exercising. I'm not a fan of any kind of earbuds, but I have an elliptical machine with a squeak problem, so these help cover that up. They clip on securely and stay in really well. The sound quality is pretty good, but not great. I use a wide hair band around my head to make sure they really stay in and to cover up the outside noise as well. Sound Quality I've never thought that earbuds of any kind have great sound quality, but these are pretty good. I can sometimes hear a rustling sound, like they're rubbing against my ears, but it's not too bad. Comfort Earbuds really aren't comfortable for me, but I only wear them for about an hour at a time, so that's not so bad. They're adjustable, which is great, and makes them fit a lot better. Design I like the design of these. They're completely rubberized, so sweating doesn't make them smell bad or feel gross. I just wipe them off with an alcohol wipe every now and then. Durability I have had these for a while, and they still work like they did brand new. I exercise with them but don't do anything super strenuous that would really put a lot of stress on them.