If you're using it for DSLR cameras remember that higher speed is more important than high capacity. Unless you have a D800, you won't need more than 8 or 16 GB. This item is advertised as 30MB/s but when I received it, it was actually 45MB/s. Pleasant surprise.
When you need speed, go with SanDisk Extreme® 30MB/s Edition SDHC™ cards and get more out of your DSLR or advanced camera, with SanDisk's fastest SDHC™ card.
Lightning-fast speed and professional-grade responsiveness give you the longer continuous shooting performance and faster photo and video transfers from camera to computer, when used with the SanDisk ImageMate® Multi-Card reader.
SanDisk Extreme SDHC memory cards now adhere to the new Class 10 specification, which exceeds requirement for today's high definition video recording..