I have and know what I like in a chassis dyno. In regards to a DynoJet dyno. I only reference them by their inertia dyno in my post. I just used them because of the brand is commonly recognized. But anyway if you can tune or know someone who can tune with a inertia dyno with no load control. Power to you or them. In regards to DynoJets load control dyno. Lots of people use them. I prefer a Mustang load control dyno. I like them because of the low inertia roller with. IMO better load control eddy current brake. The DynoJet uses Large heavy roller with their load control eddy brake dyno. I'm not downing DynoJet. They just are not my choice.