I was wondering about this, what with all the clamoring for A2DP.
I've only experienced one stereo Bluetooth headphone (I live in a somewhat isolated place) and that's a Logitech. I ordered it because it has a separate broadcasting unit that plugs into any device with a 3.5mm headphone jack and violla....wireless. Problem is, the high frequencies are quite attenuated compared to any half-way decent set of wired phones or buds. I figured it was just because they are Logitechs (even though they weren't cheap.)
So, is there a drop in fidelity with bluetooth stereo headphones?