I have only had this off-brand card for about a month, but so far, it's working great! It's a 16g class 6 and is supposed to have a life time warranty. Not sure how the warranty would work and I hope I never have to find out. It cost $53.99 US. That's the reason I took a chance on a off-brand, the price was so low.
Newegg.com - A-DATA 16GB Micro SDHC Flash Card Model MicroSDHC CL6 16G Card - Flash Memory