Look no further for the ultimate in wireless freedom. The 510 is very comfortable and easy to wear, lightweight, and has great sound quality. I generally use my 510 in the car with the windows down or on a busy street in the city. I hear others as if they are next to me.I sometimes forget that I'm wearing a headset, even though it is one of the largest sets on the market today. I had no problem syncing it to my iPhone, and I do not anticipate any problems with other devices.I do find that the power button is difficult to address when I'm wearing the headset, but nothing is perfect. The bottom line, the best bluetooth headset on the market today.