I'm actually using a class 4 samsung micro sd card in an adapter but looking to upgrade to a class 10 card so will be updating later on once purchased to let you know if it works.
I received my Pi over a week ago but only just had the chance to set it up, tried multiple laptop SD Card Readers (built in) and none worked, all returned an error (error 5, if I remember correctly), I then tried an SD Card Reader (USB) and it mounted the image to the SD Card straight away, problem ...