Convenience aside, I’m a little sketched about any Bluetooth headset that uses a AAA battery for power—sounds like too much weight for me, especially in light of the new Bluespoon AX coming out. PDA Buyer’s Guide likes the Jabra BT110 Bluetooth Headset just fine, though, at least for casual headset users. The lack of a boom makes the outgoing sound quality too quiet and there’s no mute button, but it’s only around $70.
http://www.gizmodo.com/gadgets/peripherals/headsets/index.php#bluespoon-ax-headset-reviewed-027254
Jabra BT110 Bluetooth Headset [PDABuyersGuide]