I am in the midst of testing various ones. I have the Motorolla H700, but it disconnects often. Plus it's not pretty enough for my iPhone I'm trying the Jawbone and the Bang & Olufsen now. The Jawbone has noise blocking technology, but the buttons are confusing to me. I don't know when the noise blocker is on or off. There's no real indicator except to ask the person you're speaking with, "Did you hear that construction drill?" Plus, it's a little masculine-looking for me, a female. However, my mom thought I was indoors. The Bang & Olufsen cost almost half of what the darn iPhone itself costs, and unlike the jawbone, there aren't many reviews/sample YouTube videos on it. So I tested it myself and called my voicemail from the NY street. But I called on a Sunday (today) when it's not very loud out. However, the quality of voice was better. And like my mom w/the Jawbone, my friend didn't know I was outside with the Bang & Olufsen on! Which bluetooth do you prefer to use with your iPhone, and why?