Yeah, it says Class 4 on the card but the speeds are not even close! It took nearly an hour to transfer 1.8GB from my pc to my phone (htc desire) at approx' 540KB/s!
Class 4... 540KB/s... really?!
Did the same to the 4GB Class 2 card that came with the phone and it transferred at 1.76MB/s.
This is a serious bargain! If you were having doubts about buying this, don't. I bought this for use with my Galaxy S, and it works flawlessly. Note that the Class 2 rating has nothing to do with read speeds, and watching HD movies and listening to music off this SD card works fine - this is the main reason I bought this. Even copying data to the SD card (I had a USB Micro SD card reader available) was pretty quick and painless, but you're obviously not guaranteed copying speeds as fast as a class 8 SD card for example. Still, I wasn't waiting around for hours waiting for my data to copy.
If you're thinking of buying this, definitely do.