I've got a Crankandstein. This mill has been great. Only drawback is that is comes 'bare-bones', meaning you have to build your own stand and hopper.
You really can't go wrong with any dual-roller adjustable-gap mill you buy -- and whoever you ask is always going to recommend the mill they own. A homebrewer, in his lifetime, will never crush enough grain to wear one of these thing out.
So, go with one familiar names, Barley Crusher, Valley Mill, Crankandstein or whatever, and you'll be set.
-L