What real difference will I notice from using class 2 and class 6 memory in my droid x? Will app loading take longer or will high definition movie watching be hindered by going with a class 2 card? What about using it as a mp3 player? I was set on buying a class 6 just because it was available, but I just saw a decent deal on a class 2 32gb micro sd card that is making me rethink just why I need a class 6 card.