I have been very close to buying the extremely cheap sandisk 4gb microsd however many people have said it may be to slow as it is class 2. I have now found a integral 4gb class 4 fairly cheap. Has anyone used this card or had any experience with integral cards as a whole? The class makes it more attractive than a class 2 but i am afraid integrals may just be rubbish? How well does it play "problem" games like COR?