I own these.
Pros: Good sound. No wire. Dead easy to connect to an iPhone as the audio source. Callers tell me I sound fine, not like I've got them on speaker phone.
Cons: I don't know if my head is small or average or what - but these hang down at my neck, and won't stay upright. Also, maybe my ears are small, but none of the earpieces fit me just right. I wear them to work out, so what I end up doing is tying a kerchief around my head and knotting it at the back; the tails of the knot I then knot again over the back of the headset to keep it in place. Rigged, but works.