Proper design, function buttons work properly, for cons there is no bass response without rectif with the reading software, it breaks the ears. It seems to me very sensitive to electrical disturbances and electromagnetic (not protected) to the electrical problem, I bypasses by connecting behind a USB hub. I have also solder myself the body of the USB connector on the card that is not, to have a better robustness, it seemed a little too soft. and shot straight at the welded pins.