In transfer speed, it is not the fastest I've tested and it tends to leave very quickly and then crashing a bit by making the yoyo (I wavered in 8 and 6 MB / s) . However, it was faster in my tests key to the tablet by transferring a 700MB file in one minute and 10 seconds. Otherwise, you can directly read on the key and videos instantly launch as if the film was on the shelf. And the 16GB advertised, typically, it has only really available 14.8.
In summary, I was seduced by this product that can multiply the product storage capacity without micro-SD card. Especially, small size absolutely shocked not even on a smaller device like my 4.3-inch smartphone. The only catch is that you have your smartphone / tablet supports OTG if this key does you in, not USB OTG (not compatible with your device in this case). On my 3 devices, one does not recognize, compatibility fault. A monitor so before buying if not to recommend their eyes closed.