Data transmission is fast and a difference for transmission over the direct connection of a hard disk on your PC is not visible. Both Windows 7 and Windows 8.1 have the stroke quickly detected and installed. Dropouts, I had not have but I am still wary of the transfer of my data rather than challenge him with too many GB at a time. You can use Device him to charge different USB by connecting a USB power adapter and this then inserted into the socket. I tested the two smartphones at one time and that worked great.
Since I could not see any problems until now, he gets 5 stars from me.