The adapter and the drive cage have my expectations completely. Only the instructions supplied was crap because this was just an example for the 15 "Macbook Pro. Because versed technically gifted me and tehcnisch this was not a problem. On ifixit.com you can also find detailed illustrated instructions. Even the external drive enclosure that often berwertet Miess has served its purpose more than well. It is instantly recognized on a Mac and the CD / DVD and do not clamp during ejection.