I have a City Vario and I find its acceleration and top speed to be quite impressive. For starters, acceleration is quite nifty, especially in "S" mode, where the RPM goes all the way till 6,200. It takes quite a while for the speed to pick up, but when it eventually does, its pretty neat. I've hit around 165Kph on Margalla(my all-time fav!), and for a vario that isnt bad! DOHC RULES!