I'm going to say you would be hard pressed to tell the difference in the crush from a 2 roll and 3 roll mill. For the homebrewer a 2 roll mill is more than satisfactory. Especially if you condition your malt, a 2 roll works great. The purpose for a 3 roll is to keep more of the husk intact. The first setting flattens the grain to loosen the husk and the second crushes the grain to a set gap. I bought the MM-3 with stainless rolls. I didn't want to worry about rust and the crush looks great. Did I need the MM-3, no, but I had the extra cash and do not regret it at all. The hopper was easy to make and I've never had an ounce of trouble. Call Fred and talk to him about it. He was great and told me all I needed to know. I'm going to start conditioning my malt and I think I will be glad I bought the stainless rollers. If I had it to do over, I would have saved some money and bought the MM-2 with stainless rolls and a 1/2" drive shaft. I drive mine with a 1967 1/2" Black and Decker drill that runs at 260 RPM. A 1/2" drill is a must in my opinion.