Let me start be stating that the audio quality was acceptable, both for calls and music, but overall, the design is seriously lacking in the following respects:
1. The power switch is integrated into the headband hinge -a snap open, fold-and-slide affair that feels rather insubstantial and twice collapsed (inadvertently shutting down the radio) while in the process of taking the unit off my head.
2. Beyond the power switch functionality, the folding configuration provides no significant space savings. It's not as though collapsing these headphones will make them any less bulky in a laptop bag or purse.
3. The earpieces do not pivot or swivel at all -basically, if your head isn't a perfect fit (and mine isn't), they don't sit right on your ears and constanly slide off.
4. The software-based, touch sensitive volume control is a profoundly unreliable, counterintuitive gimmick. A hardware dial or rocker switch would have been much better.
5. The headband and earpieces are lined with some kind of synthetic velour that traps lint and fuzz admirably, but doesn't add to the comfort. And finally,
6. You can't control the tracks on an iPod Touch or iPhone 3G/3Gs with it. I know that's not Jabra's fault -that is a problem with Apple's current version of A2DP, so I don't consider it a knock on this product per se. I just mention it for the benefit of anyone planning to use these with one of those devices.
If you're really in love with the aesthetics of this unit, consider the Jaybird Sportsband. They're $10 cheaper, and they have basically the same features, but the earpieces adjust to the shape of your cabeza and you get real, tactile controls.