the reason they make a new product, basically means its better, now which one do you want.
anyways, i have both, and in this day and age, people like fast, and the ipad 2 is noticeably way faster, i'm impressed and love the speed, only because i know the difference.
like when i use an app like Djay, it pops-up memory is low, and sometimes do a lot of buffering..... and DJay has ipad2 only features that ipad1 isn't capable of.
same goes for some games, ipad1 cant handle them sometime, and most times just exit the app(crash).