OK having had the calmini 5 1/2 inch shackle reversal combo lift (under 900 bux) on a zook for like 2 years here is my honest opinion, this is about the 5 1/2 combo WITH the shackle reversal mind you so keep that in mind.
i caught over 3 feet of air at least 100 times and haul ass in the riverbed going 30-40 mph over 1 foot whoopdedoos 2 feet apart 50 yards long all the time with the system and absolutly love how it preformes, it is the only calmini product i endorse and by far their best kit. it turns any stock samurai into a moonshine runnin cadillac any duke would enjoy. i never bent an axle or messed anything up on the samurai while i had this system on my zook. ever since i changed my suspension i have had more flex, higher ride height etc etc but i lost the cadillac feel.
tip of the week: if you do what i did (remove the shackle reversal and run the same front springs the normal way it pushes your front axle foreward about 2 1/2 to 3 inches and with 33 inch boggers they are about even with my front bumper for a 90 degree approach so you can climb house walls if you want.
you can comfortably run 31 inch tires with this kit and it replaces the complete suspension, break lines and bushings for a brand spankin new feel. i miss it every day but i needed to accomodate my new shoes (33x14x15 tsl boggers) so i upgraded.
just my .02