I'm very satisfied.
Only 29.3GByte of 128GByte OK. Other 95.5GByte was fake.
The pen drive is sold as 512Gb, but real capacity is around 25Gb. All files above the vague real capacity limit will be lost. The most tricky is, they appear to be there, but they are not accessible. Upon removal of the pendrive, most of the times those files just disappear without trace. Be very careful, I don't recommend this product nor the seller.
This is a FAKE product. H2testW results attached. most of the drive is corrupted, files are LOST. Speed is ridiculoual slow. the full h2testw took ~50hours to run, more than 2 days, due to a ~2.85MB/s read speed (USB3.0 speed would be ~60-150MB/s, USB 2.0 ~10-30MB/s. it is just USB1.1)