I bought the Model P (pre-adjusted). I have used it twice for my only two all grains. The crush is excellent. My efficiency is around 75% batch sparging. My drill works hard, but it manages.
I have the adjustable model. I bought the "bare bones" version and built the base and hopper for it. I can crush 15 pounds of grain in one run and using my 1/2inch drill motor it takes about 3 minutes. It is a great mill!