I currently run Hotchkis springs and their new shocks. The ride is very firm. No issues on a smooth road but you don't find many here in the midwest and I drive mostly on the street. Hitting bumps make for a bit of a harsh ride. That said I have been looking at some of the RideTech stuff myself.
I stopped at the Ridetech booth at Goodguys. I'm a little torn on the composite springs. I don't know how they would hold up behind my 455. I don't have any wheel hop now and I'm concerned with leaf spring wrap and possible breakage. I know when the composite leafs came out years ago some were breaking them.
Other then that I like the idea of the dual rate front spring. I like the delrin bushing they offer. I don't know anyone else selling the bushing package like stock.. The RideTech shock they sell are from the same manufacture FOX, as my Hotchkis 1.5 shocks and they are nice.
I would advise to just stick to one manufacture and go with it. You may want to check on the 1stGen Camaro site for more info on this. I personally like the sales pitch and the target audience of the street Grip system.