I can and will only speak for myself but I have been doing business with MM for well over 20 years and have always been treated right and taken care of. I have never had an engine built by them, but have bought a lot of bolt ons including a set of old cnc'd stage 6s that I still have and probably have put 3000 passes on over the years. I am currently helping assemble a 74 Duster with a brand new MM 511 in it...I recommended MM for the build...should have it fired up in a few weeks...