The BTD 500 USB Sennheiser and a corresponding APTX - enabled receiver (eg Nokia MD-310) can be easily realized at last a high-quality wireless music transfer from PC to the stereo. Subjectively is no deterioration to the wired transmission detected (a meticulous A / B listening test or comparative frequency measurements I have not been carried out).
Criticism is that Sennheiser no drivers for the device provides for download: If the online bonded Update function on the computer for some reason do not work or you want to install the device on a computer without Internet connection - too bad (I do like to disabuse and give then also like a perfect score).