Motorola MotoROKR Behind-the-Neck Bluetooth Stereo Headset (Black)

Pros: The sound quality is amazing.
It connected to my iPhone without any issue.

Cons: I could see where it might be somewhat uncomfortable to someone with a large head.

Summary: I had the previous version of this headset (the non-HD version) for over two years. I used the headset for 8+ hours every day and it just recently gave out (the usb socket wore out). So I decided to get the HD version and I couldn't be happier. The sound quality is better than any other headset I have ever heard (bluetooth or otherwise). The HD version also fits much better and does a much better job of blocking outside noise.