I have been using lots of memory card from 5 years including all major brands like sandisk, kingstone, transcend, strontium but the best one is the SanDisk one I have used 8gb class 4 as well as 16gb class 10 memory card both are giving me an super performance everything is working fine it is also shock and waterproof.
It comes with 5 years of replacement warranty but I never found any problem in both of them price is also very reasonable as compare to other ones I am very happy by using this product. I would like to recommend it to everyone.