Not sure if I'm ready to give these more than 2 stars yet. I've used them twice. Once was riding my mountain bike, the other was yard work. For riding, these things seem great, no wires, solid feel in my ear, etc. However, if you have the phone in your back jersey pocket(same side as the BT receiver) you get fairly choppy sound with loss of signal. The headphone is within 2 feet of the phone, but apparently they don't transmit through your body, so its slightly frustrating. I was happy when I didn't have to look left, as that's where I lost my sound.
During yard work, I had my phone in my right front pocket of some shorts, and the sound wasn't cutting out or choppy nearly as much, but did have some interruptions.
I'd give these a solid 2 stars for the first two uses. I plan on trying them with my phone in the top pocket of the hydration pack (closer to the ears) to see if that helps at all, but it may be better to fork out the money for the nicer version coming out soon or some Jaybirds.