You have to make your choice based on the use, this is not just a key USB3 among others.
It is primarily a key that does not exceed the port too, which in addition does not exceed the sides, which will not interfere on your laptop or hand-held on a car radio ... Well, you see the specificity .
By cons, if it is not what you want, why settle for the meager 20MB / s write (read much faster I admit)? Other key 64GB reach 194 MB / s. If you want a quick drive to transfer movies on desktop PC, so this is not necessarily the integral need ...
In short: It's very good when you think about the use and foremost that we are not mistaken. And it is very average when we imagine that this is the key to everything and that it is compared with the behemoths.
