Began to loose the connection at a rather early stage. It may be enough to touch the mind, for it to lose contact. It's very bad, because it can lead to data loss, and damage to the hardware. In a case with encrypted USB memory, it becomes you also have to unlock the encryption again, when connection re-established.
Read Speed: 30.69 MB / sec
Writing speed: 9.64 Mb / s
Tested with a file on 2'362, 86 Mb