A stock banshee is not quick. It also has terrible handling. It is way to narrow and is actually top heavy.
Once you drop some cash into the suspension, making it wider, it is a lot better.
Shit, 10k into a banshee is nothing really. Buying a quad for 2500-3500 (stock). Dropping 2500 (arms, axle, shocks, stem, damper) into suspension, then another 2k (porting, new top end, head, reeds, clutch, trans, and nee parts) into engine parts, it would be a good banshee. That is 8k and it is still a stock size engine with some work.