Tested an adata microSD 4gb(turbo) using the same adapter has read of 16mbs and write of 6.5mbs. The camera this is to be used in is a Nikon CoolPix s570 (12mpxl) so the write speeds are essential when trying to get multiple shots off.
Its inexpensive and meets SDHC class 6 specs; If you have a low res camera 8mega pixels or less you're good to go
It does not exceed class 6 specs; tested with atto disk bench reached 5.6mbs-6.2mbs for writes and 11.4mbs for reads