As some of the threads stated, you are paying some $$ for the name. But you will be buying are reputable product. The owner of Renntech left the AMG division of MB in 1986 to start the Renntech company. I went with them because they will stand behind you and their product if any problems come up down the road. The hardest part of the install is getting the crank bolt broke loose and re-tq. to spec, It's more than just tight!