AWESOME !!! At that price, it is almost given. The benchmark tests are exceptional, much faster than my other SDHC Class 10 card that I had before. I use a Canon 550D with Magic Lantern mainly for video, and before I had any worries because registration cards that I had not fast enough nétaient write (yet SDHC Class 10 also). Registration sarrêtait unexpectedly and it was very problematic when making short films. With this card Transcend Class 10 UHS-I 600x NO MORE WORRIES. I plan to buy more so I am satisfied. It is almost as fast as 60 cards sold for the same characteristics.