Recently installed the H&R sport springs. Fairly straight forward. I also added stiffer sway bars, Tarett camber plates and rear toe links. The springs are definitely stiffer than stock 06 C2S Sport springs. Ride height is perfect. Struggled to find anyone willing to do an alignment then stumbled on a Chevy dealership that does a lot of setups on Corvettes. Great alignment rack and tire changing equipment. My own specs for $69.95 and it's 2 miles away. Nearest P dealer is 50 miles each way. If they don't glare at you it's a nice lower cost alternative for some simple needs.