These earphones work very well most of the time. I've noticed that when my phone switches service level (3g to E or G) the audio cuts out of the music that I'm listening to. I'm using a T-Mobile G1 with the earphones. I've had other problems where on startup of the earphones and the phone's bluetooth component the phone doesn't respond at first and then proceeds to turn on the music and starts making calls all at once again I'm not sure if its the phone or the earphones.
I actually got mine with a helmet. these phones are included with the Giro G9 audio helmet. check tramdock.com. i got the package for $106. They might also be included with other giro wireless audio packages. the G9 helmet isn't the best helmet that is offered the g10 has adjustable vents were the g9 has plugs that can't be put in without taking the helmet off.