1. the connection with only one USB port is much more better to use than a Y-cable (with 3 USB ports is otherwise only one left)
2. It fits perfectly into the side pocket of the carrying bag with the purchased Ultrabook
and 3. it is very quiet and has a very fast response
The only personal drawback: It fits visually not quite as good for Ultrabook as intended, since the surface of Ultrabooks from Aluminum is.
Nevertheless, the drive is clearly recommended.