Russ, stop worrying. 64 1/2 is the new......uh, 64. Of course you already know this (from riding your 150), but, 'twist and go' is pretty easy to get used to if you ride in traffic a lot. Except for the way they handle the 'twisties', I don't find a lot of difference between the scooters and the 'real' bikes. Be safe.

chas