by cons for those who have USB3 USB2 standards and the difference is huge!
speed USB2: 37.25 MB / s read and 30MB / s write
USB3 speed: 90 MB / s read and 80MB / s write
I note that I had to buy my basic tablet Galaxy Tab 10.5 S has a USB2 port I saw at the last moment!
so not worth breaking the bank for nothing, a class 4 and will do so for less expensive than one which can not be operated properly in my tablet
To take his eyes closed for the USB3 only! otherwise it's not worth it at all