I bought two of these the other week. Have only used one in the camera as yet and it has performed as expected. I don't expect better performance than the standard silver/orange 45mbs Samsung cards, of which I have several, due to the limitations of my several camera's buffer systems and transfer rate. The orange/silver cards are also UHS1 [or whatever it's called] and exceed all the performance criteria of my equipment. So why did I buy the 'Pro' black card this time you may be thinking. Easy, this offer is cheaper than I can currently find the orange/silver card.