I bought the SanDisk Micro SDHC 16GB for my phone Samsung i900. Then I described them to the USB reader with data and Kate experienced big surprise .... Although the card is Class 2 provided (which corresponds to a data transfer from min. 2 MB / sec.) I could with 8-10 MB / sec. !! describe. Read the card with about 15 MB / sec. That's a very good value for such a small data monster. In the mobile phone, I could see no adverse effects on the 8GB card, rather a slight increase in performance at data accesses to the card.
Conclusion: SanDisk has proved to me again, they produce MicroSD cards of the highest quality and understate their information rather that. Absolute recommendation.