Unless you're going to be tuning every nuance in your suspension setup and taking this tuning to the track with you, then you are wasting money. On the street you'll notice sfa between a the Zero 2's and a change of springs / Koni Yellows as an example. I think I've only seen two people on this site actually use the Zero 2's to their full extent, one being Superdave who tracks very often. All the other people that jumped on the Zero 2 bandwagon said they just wanted a better handling setup combined with the fact they have the ability to change the ride height. The funny point here is, everyone set their ride height and just left it...and never touched it...again. You can do the exact same thing with springs and shortened shocks...yay. Using the Koni's as an example here, it works out a lot cheaper than the above figures, and they're Koni's so they are high quality. Note: I might add that yes, once upon a time they were only a few hundred dollars more expensive than a the above example (Koni's). Personally I can't blame the guys who took advantange of that, granted.