Would any of y'all recommened or use these on your own engine?

Cryogenics is awesome. There is a local shop here that can do brake rotors if you have a warping issue. You will never have it again after spending the $40 to get them cryogenically treated. They do gun barrels as well, and they are never more accurate. Is it worth it in a mild 318? If you want to keep it forever, sure.