The SanDisk achieved in the card reader of my iMacs with Retina Display a write speed of 49, x MB / s and a read speed of 68 x MB / s (tested with Blackmagic Disk Speed Test, 5GB test size SD card as exFAT formatted). I consider these values for absolutely fine and therefore forgive 5 of 5 stars. If the memory card goodbye sometime or cause problems, so I will revise this review course.
In my Pentax K-5 it is recognized perfectly with full size. The frustration-free packaging is great and includes a plastic storage box.