The hands-free aspect of using a Bluetooth headset with your phone is definitely a plus, but actually wearing one can be kind of a drag. Personally, I always feel like an idiot when I'm wearing one in public.
I'll wear mine if I need to have both hands free during a long phone call. Otherwise, I avoid them. Headphones with a mic in them are my dream solution to phone-holding problems, but I usually just hold the phone up to my ear like a chump. How about you? Do you wear one all the time? Never? As a fashion statement? Only on Thursdays?