I've been on a bit of a headphone kick lately, and have tried out a number of sets from various manufacturers. The only on-ear headphones I've tried during this time, though, have been AKG's K 830 BT's, the company's only high fidelity Bluetooth headphones. Bluetooth headphones remain a relatively young technology, and have been growing steadily as more and more computers and smartphones adopt the A2DP Bluetooth audio transmission standard.
The 830 BT's are a very comfortable pair of headphones with some nicely designed (if plasticky) on-ear controls (track skip, volume, answer call, play/pause). But like all Bluetooth headphones, they suffer from diminished audio quality when compared to their corded counterparts, particularly at high volume and high frequencies.