I was in the same boat a few months ago, couldn't decide between a two or three roller mill. I've been brewing for a few years and got tired of my inconsistent crush at my LHBS. I also have the tendency to purchase grain a few weeks before I brew and never liked having crushed grain sit for very long. It's nice being able to crush while my strike water is heating up. I decided to purchase a three roller Monster Mill. I figured I might as well get something nice that's going to last. I knew I would kick myself down the road if I only purchased a two roll mill. I'm very pleased with its results. If you plan on brewing for years down the road, which I intend to, why not spend a few extra bucks and get the three roll mill? A two roll mill will work just fine, but if you're questioning which one to get, why take the risk of purchasing something you may want to upgrade in the future. Just get the three roll mill.
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