No the upgrade is like upgrading from chair to sofa
it is much more comfortable doing power user hacky stuff with more horsepower even though it is feasible on device 600mhz as its stock clock
P.S the thought of a 1.5ghz dualcore oc'ed to 2ghz makes me jump up and down (it would also probably double up as a mini oven/microwave(useful for borrowing a friend battery draing it 5min then returning it dead kind of pranks ))