Despite the reviews of the R4 and M3 Simply, I just wanted to report I do in fact see stuttering in the FMV to Casltevania Dawn of Sorrow. It's not extremely terrible, but it's there. In fact the FMV completely craps itself when the girl dodges a fireball. Playing the actual cart, this of course does not happen. I am using the A-Data 1gb microSD which I was told is rated 5 out of 5. Guess not. I guess I will try a Sandisk next! Just wanted to report my findings for you all.