I bought 3 of these SD cards for my Pentax K5 and have to say that I am fully satisfied. The writing speed is good and allows fast continuous shooting and transferring the images to the PC is also done quickly. The design and craftsmanship make an impression of quality and so far I had no problems with the stability of the card. Packaging is a bit annoying but once you get the hang of, it's not so complicated to get the card.
Something bad is that no protective cover is included.