I actually thought I had ordered a Sandisk microSDHC 16GB Class 2 Memory Card with Adapter Photo at Swiss Watch, but I get a Sandisk microSDHC 16GB Class 4 memory card with adapter Photo. Furthermore, I am of course not angry because the class 4 card is but an entire bit faster (in terms of read and write speed) than the Class 2 card. Overall, I think the card is definitely fast enough for all applications on my Desire.
In addition, it remains to be said that the map, as far as I can tell so far, the usual Sandisk has quality and thanks to the supplied SD adapter (adapter Photo) data with the computer can be exchanged more quickly than over the phone and the Map in most devices with SD card slot works.