Have some recessions read before I decided to buy it. So, SD cards and USB sticks are easily recognized. Movies in AVI format can be played without problems. Also simultaneous streaming of two different iPad's presents as a problem. The free app is good, but as in other recessions I can only recommend the paid app "nplayer". Price about 5 !! After that the card reader is just great. The battery life is not quite at 6 hours, 4 hours as specified, would have been more accurate. Nevertheless, absolute buy recommendation from me !!