Just got a pair today man they are amazing! Completely blew me away with the lossless sound quality. Blindfolded, I compared it to a wired HD600 unamp'd and I couldn't tell the difference.
The Sennheiser IS850 has an internal DAC/AMP on the headphone itself!! And the run on rechargable AA batteries. Why isn't there more buzz about wireless headphones like these? Wires are a pain in the ***.
My only complaint was that the (lossless) infrared transmission could pick up some static if there are too many other electronics nearby, but in the manual it said to place the transmitter as high up as possible, and that did the trick.
Anyone else have any thoughts/comments on the IS850's?