Matt,
I finally took my 904cc Speedy for a 100 mile cruise yesterday and, let me tell ya, you are going to enjoy your bike. The biggest difference, as far as I'm concerned, is the extra roll-on power from, say, 75 to 80mph. Just whack the throttle and you're gone!
This is convenient in those situations when you're next to a big semi-truck and he starts going over in your lane because he doesn't see you. In that situation, before (with the stock 790cc motor) the roll-on power was paltry, - whereas now the roll-on power kicks a$$.
Enjoy,
-BT