I bought this card as a backup for my 16gb UDMA 600x compact flash card. Have now decided to keep 16gb as back up for this. I have a Canon 7D which fills up the card quickly on burst catching wildlife, and didn't hold up the shoot at all because of speed of 16gb. This card, wow, knocks the spots off previous 16gb one. Also have a card reader that fits into my eSata slot on the side of laptop and BINGO less than ONE minute to download Raw+JpegL 230 shots, like fliking through a pack of cards, well not quite but it was blooming fast. So no probs with card and reccomend to all, I would also recommend the eSata reader bought from Amazon, magic, take about 300-400 photos a day take the laptop out and before the next bird has appeared its done.