Originally Posted by Shoyu Burner

The crazy bouncing cars you see are probably blown shocks/struts. They slam their cars, sometimes by cutting coils off of their stock springs or clamping them, then quickly blow out their stock shocks. That's the extreme bouncing I am guessing you are seeing. If you stick with any of the moderate-drop name-brand stuff you won't have to worry about any of that ridiculous bounce. However, as I'm sure you've already read, the aftermarket springs will usually cause more wear and tear on your stock shocks, so eventually you'll get more and more bounce. But by then we should have some good dampers available to choose from.