I fall into the Barley Crusher group. I am About 100 batches or so In to it and it is beginning to loose its grip on the grain. I took it apart and cleaned it real well, and oiled the rollers. It's working, but several times while trying to crush a batch it looses its grip on the grain and just spins. I've given up on the drill because it would never bite on the grain. I put the handle on and it works, but as, I said it looses it grip. I found if I turn the handle backwards a rotation or two, it will then bite onto the grain again. I have ten kegs (full) standing by waiting to be tapped, so I have a little time to wait on the crankandstein folks to get back up and running.
I do like the look of the 3D with the geared rollers, something I was surprised all mills didn't have.
PS: I usually brew four to six times per month, five gallon batches.