I use this key for several months, the operation is satisfactory; but the speed even usb3 is not impressive, it is in the standard. I received it on time (1 working day, although it comes dAngleterre) Warning formatting is in "exFAT" that runs on Windows XP with an update to download. If you are offered a formatting: especially not to accept (loss of all your data). I put only three stars to make smaller advertisers! (Humor)