Tired of being corded, I ordered these for use on my tv ( for Rock Band without disturbing the others in the house ), and for my listening pleasure at work.I use the Sony HTS-BTA2W adaptor to go from stereo-out on whatever bluetooth-less device that I want to hear, and it syncs quickly and reliably. Note - turn on the headphones first, then the BTA2W ( once they've been paired ) and you'll get a quicker syncup.The phones have a great comfortable seal, and block out much external noise - I occasionally wear them in the datacenter and it blocks out probably 70% of ambient even when turned off.Sound quality is great, but not stellar. My Sennheiser HD555s beat them, but not by much. With MP3s you might not notice the difference.I would have given these five stars, except for:No removable battery.Can't listen and charge at the same time.Not a terrible problem - batt life is at least 6 hours - but eventually rechargables lose their ability to hold a charge and this pair will be done... or subject to surgery.