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.
Summary: It's a good thing I took the time to stress test the card by attempting to fill it and verify the data because it turned out to be faulty. If I just used it to snap pictures, it might have been months before I filled it up enough to discover it was bad so I'm glad I found out before the time-limit so I could return/exchange.
Pros: None so far.
Cons: Copied about 8 gigs data to the card before it refused to write anymore. No format, no partition, disc management, or camera could read/write to or format the card. It's completely dead.