love mine. i'd prefer a progressive spring but can deal w/ the linear springs of the gc's. some friends wouldnt want it in their cars but they arent car people. my friends have a 1/4 turn and rears 1/2 turn and thats plenty for me. i tried 1/2 turn for the front and it was too stiff for me. dont know what the install costs. my local members helped me.
