I guess I am asking if anyone has one of these and if they are worth the $$$?
I have one and I highly recommend it. I think it is likely that it will improve the sound of all your music files regardless of their encoding. Just download the latest driver from the M2Tech site it is a noticeable improvement over the original driver. I use it with a cheap self powered usb extension which eliminates the need to plug this monster directly into the usb slot and also provides it's own power source.