Summary: If you plan to do any video recording, buy anything else but this card, as it is waaaayyyyy over rated on write performance.
Pros: Relatively cheap
Cons: This memory is very far from class 10 rated. I bought this from a Big Box vendor due to having my new Canon 60D come in time for use for Memorial Day Weekend. I cannot record more than 10 seconds of high ISO 1080p at 24fps before the buffer light would appear (meaning the buffer was getting too full) and then the camera would shut down video recording.
Excerpt: I bought two of these fast cards for continuous shooting in my Sony SLT-a57. What a dissapointment it was when I actually performed a speed test. Read/write speed is slighly over 19MB/s instead of the claimed 45MB/s! I thought it might be because of USB cardreader speed, so I did the test on another computer wich has a built-in cardreader and runs Windows 7 instead of XP. The results were virtually the same.