Pros: Comfortable, good sound quality when works.

Cons: Typically have to turn on, turn off, and turn back on for it to pair with my iPhone 4. Drops pair randomly even with a full charge during calls. Folks have said that sometimes my voice sounds garbled. I can be sitting close to my phone on a call, but if I turn the left side of my head away from the phone it sometimes makes a caller's voice garbled.