i'm using mostly sandisk (the class 10 extremes for video) - no problems so far.
also i didn't have problems yet with kingston & transcend (although both seem to be slower than the sandisc cards). i had to recover data twice on them, but i i'm pretty sure that those were recording errors made by the device (e.g. power removed while recording) - i was able to recover all data, so that speaks for the cards.
but on the other hand - those sandisk are pretty cheap and i've only heard good things about them.