I (try) to race one ...
Not very thrilling to drive unless you have the gearing matched well to the engine. Good torsion bars and shocks are a must, otherwise its very loose.
One good thing is that you don't need the brakes very often ...
Some pics/info about my race bug in this post;
http://forums.pelicanparts.com/showthread.php?threadid=127005
I had some on-track photos, but I can't find them at the moment. Ask me anything you want if you have questions ...