Transfer rates for reading and writing are good, nothing more.
Compared to another key in my possession, it is nearly 2 times slower, but the fastest costs almost double for the same capacity!
All this is very average but still deserves 4 stars for the price ;-)
Small rant for manufacturers:
Why a majority of USB keys are they sliding?
This is absolutely not convenient to handle: the key retracts when inserted.
It protects nothing at all: the connector portion is not protected from dust.
Came back to just plain caps, can necessarily lose, but once lost it is not worse than the solution ;-)