For the money this is a superb device, it's fast at reading and writing which is what you would expect.
However, I have encountered one problem which is the reason why I have only given it 4 stars, in order to use the device you have to slide the side button, this retracts the USB mechanism, when you plug in the device, this sometimes forces the USB back into it's housing therefore not activating the device.
I don't know if Kingston are aware of this little problem, there should be a means to lock the device in the open position. The other good benefit is the 5 year guarantee