My LHBS has an adjustable JSP Maltmill -- the model AA, I believe. It seems to be pretty badly worn out, and the crush setting drifts as I proceed through a 10 - 12 lb grain bill. Furthermore, the particleboard side pieces are broken and this makes it difficult to effectively tighten down the thumbscrews, which is necessary to keep the rollers in place after adjusting. It's been at the shop for a couple of years, according to the manager. Now, I have no idea how often this is used, and it's available for any Joe Six-pack to come in off the street and use, so it has probably had a rougher life than most home mills. But my experience with it did lead me to get a Barley Crusher instead (or, rather ask Santa for one).
Just my $0.02, and if taken care of properly, the Maltmill may be a great product; I just can't say for sure.