I have a Crankandstein mill here. I bought it about three years ago when the rollers on my JSP mill finally wore out and Jack is no longer in business.
I love the mill! I have the three roller version here that has one dynamic roller and two other static rollers that turn when the grain is forced between them.
I actually wanted to get three roller version that has all of the rollers driven like the model a brewery I help out in the winter months in Cocoa, Florida has, but that was a higher cost and this one does the job just fine. Make sure to get the hopper for it as it will hold about 5-6 pounds of grain so you can re-fill the hopper less frequently. I also have mine motorized so I don't have to manually turn it by hand and get a more consistent crush.
I have only had one problem with the mill in which the top static roller wouldn't turn after the humidity caused the grain dust to gum up the ends, but a good cleaning with a brush and a hand held vacuum quickly fixed the problem. Obviously, this is not unique to this mill. You will also have to install end plates on the sides of the mill, but I did that with some aluminum sheeting and aluminum tape I got at Lowe's. It only took about a half hour to cut the sheeting and tape it in place.
Three roller mill or two roller, that is your choice.