they are a constant drain on your wallet (ie fuel, hopups, tyres, etc) but hey if you like them it wouldnt matter,
but if you buy brand new you have to run it in which is a boring task.
i have a hpi dvd which shows you how if your intrested?
also once its finely tuned, due to the havoc being 2wd with a 4.5cc engine with all that power going to the wheel it can wheelie