I am still getting used to wearing this earpiece, but other than a little bouncing-movement, awareness that it is there when I'm walking at a brisk pace and learning how to syncronize it's use w/ my new Motorola E815 Bluetooth Phone, I'd give it 5 stars....Great not to have to lift my shoulder anymore.  My Chiropractor Gives it 6 stars, and he doesn't own one! (Yet).  Love not having to program each contact ph. number to anything, as the phone improvement takes care of that.  I learned it's awkward trying to verbally dial a call while standing in line at the checkout counter at Albertson's, but ya gotta learn protocal somewhere, eh?  Yep!  Good piece of Techn here!  Go for it!