Been using this to stream music from pc/mp3 player/smart phone to bluetooth speaker in kitchen, and a QED UPLAY receiver linked to a stereo. Both the bluetooth speaker and the QED support the apt-x codec in this jaybird, and it really does make it sound fantastic. There is a huge difference from a normal bluetooth connection, and it sounds crisp and bassy. I also tried it with non-apt-x speakers, and it worked well, but sounded just average, with some small distortion as expected with regular bluetooth.
Worth the money in my opinion for easy and cheap multi-room wireless music.