The main reason for getting these headphones is that you don't want to look like an idiot with big elephant-size headphones hanging on your head - like most other bluetooth headsets look like.BUT, the size is the cause of most of the problems. Because of the size they're apparently not able to get a big enough battery in to make battery life acceptable. It's okay, but these are the first headphones that have actually gone dead on me because I didn't charge them enough.Also, size apparently effects the transmitter/receiver in them. People I talk to on the phone constantly complain about my voice dropping out. And if the headphones aren't reasonably close to the phone, or the phone's not on the right side of my body I start hearing static.Also, related to phone calls, and this is the most annoying thing of all - when on the phone you can only hear out of one ear! Super annoying! You might say so what - you can only hear out of one ear on a home phone. But with a cell phone you're outside where there is more noise and often times the ability to hear out of both ears is the difference between being able to continue the conversation or having to end it.Plus, it's really annoying to have the ear buds in both ears but only hear sound coming out of one ear. What were they thinking!!??And I agree with the others who have slightly larger than average heads. They're really uncomfortable after about 10-15 minutes. They really squeeze on your head.