yep, he is right. Bilstein dyno tests all of their shocks before they go out the door. They have done testing that proves that their shocks hold 95% or better of their shocking ability even after 100K miles of service. There really is nothing to wear out on their shocks like other brands. Apparently Edelbrock tried to copy their shocks but apparently their shocks suck. Plus, all Bilsteins are warrantied for life. I know Rancho's are too, but try to get a Rancho warranteed is like trying to take candy from a child. PITA. All of Bilsteins warranty work is done here in San Diego and all you have to do is send it in, they will take it apart, change what needs to be changed, fill it up with new oil, dyno test it, and ship it back to you. No problemo. nice people to deal with.