Write: It's dead slow. Writing a single big file, on a practically empty FAT32 partition that holds just some encryption software provided by SanDisk, the speed periodically sweeps from 1.7MBps to a peak of about 7MBps:

Read: Speed is about 12MBps, and mostly constant. Not as bad as writing, but far from good.
Capacity: 62.7GB (base 10). Not the first time I see such a thing, but I still think not providing the advertised capacity is cheating.
Physical: Also the physical design is questionable. I thought the outside of the USB connector is supposed to act as ground?
For comparison I checked a 16GB noname UFD. It peaks at just 6.5MBps but the speed is constant, so on average it's faster than the SanDisk.
At least the SanDisk is faster (I think?) than a 1GB noname UFD I have, which writes at 3.5MBps. But the noname's speed is stable.

