Properly Speed-wise. Depending on the size of files to be transferred read speeds of approximately 110 MB / s and write speeds of 20 MB / s.
However, the stick also extremely (!) Gets hot. One can the stick shortly after stripping not hold in your hand!
The main drawback, however, is that the stick is apparently not compatible with most car radios. Music is played incorrectly defies correct formatting (FAT32). (S. Also other reviews)
This is a KO criterion for me because I wanted to (a) use for the car radio stick.
And yes, I rate the stick badly ("Gefäält me not") and not the car radio, as all other USB media have operated without hesitation and I therefore the stick just "do not like" (and not my radio).