I can recommend the card reading rate approximately 17 MB / sec. what a very good is worth to the excellent writing value comes from about 9 MB / sec.
which is far above the Clas 6 standard. I use the card in the HTC Desire HD there connected via USB as disk makes the card ca.9,6 MB / sec. Writing,
and ca.17,6 MB / sec. Read. Absolutely brilliant. Previously had another Class 4 16GB this did not in my Desire HD 3 MB / sec write beyond what was not good.
So recommendation from me, plus compared favorably :-)