Instead of 64 GB only 57.6 GB (61,892,788,224 bytes) ...

The stick is visually appealing, really small and is probably the absolute minimum level for an OTG-Stick. The micro USB connector is through a small plastic cap, but which (unfortunately) can not be fixed, to be protected. The loss of the cap in a short time is therefore quite likely.

The drive runs under FAT32 and was recognized under Windows 7. On my Nexus 7 [2013] the stick runs through the App "Stick Mount" (Root required) without problems. However, I was very irritated that instead of 64 GB only 57.6 GB (more precisely: 61,892,788,224 bytes) are available. This is annoying!

Geschwindkeitsmäßig there is in my view nothing to complain about (CrystalDiskMark 3.0.3 - Windows 7):

Sequential Read: 29 184 MB / s
Sequential Write: 22,955 MB / s
Random Read 512KB: 29 636 MB / s
512KB Random Write: 10,041 MB / s
4KB Random Read (QD = 1): 3,563 MB / s [870.0 IOPS]
Random Write 4KB (QD = 1): 1,022 MB / s [249.4 IOPS]
4KB Random Read (QD = 32): 4,068 MB / s [993.2 IOPS]
Random Write 4KB (QD = 32): 1,541 MB / s [376.2 IOPS]

All in all, just a sensible investment.