I was a little apprehensive about buying this card because it was stated that this is a Class 10 as well as a UHS-1 card.
In the fine print on the packaging, it actually says the maximum speed requires UHS-1 compatible device.
While I'm using this on a GF1 camera bought in 2009, I'm getting performance that is significantly faster than my previous Transcend Class 10 SD card.
The maximum official speed is stated to be 85MB/s. And Class 10 speed is 10MB/s.
From the performance I'm seeing, this card is quite fast. Performance difference compared to the SanDisk 95MB/s card which I also have is not huge. However, the price of the SanDisk is much higher.
So overall, this is Transcend SDHC card is really worth the money.