I have a iPod Touch I won as a door prize at an Xmas party. It's running version 3.1.3, and it's not dramatically slower than my iPhone 4. I'm worried that if I upgrade to 4.2, it'll slow down the way my iPhone 3 did after iOS 4.0. Should I notice much a difference, or will the advantages to 4.2 outweigh any slowdown I'll experience?