I use these at the gym, connecting my favorite MP3 playlists. Great sound,no difference between the wired headphones and these. I've also have used them to make calls and receive calls on my phone(not often), people tell me that I sound fine. NOW the glitch, I use these strictly for music listening on the train, or connect to my laptop for movie watching and they work great, but I do notice that if I'm listening to music with my Blackberry curve and a call comes in the music shuts off and I can't hear the person calling me. I don't know if I'm doing anything wrong, I do press the connect button on my phone and no sound. If I call out to a party, no problem. Since I'm using them as headphones for listening only, no problem!