I bought a barley crusher last Christmas. Also bought a 1/2" industrial low speed drill from harbor freight. Eventually, I'll get around to building a mount for it but, for now, I don't see the need. Works great! Haven't had any problems with it.
My brew buddy has a barley crusher and I opted for the monster. I used his while I saved up for my monster, now his is broke and he has ordered a monster. Like it what was said above, but nice or twice. I recommend buying from monster directly.
Lots of threads on this topic. I've posted before that my barley crusher does a good job. It is still working just fine. I've done about 15 batches on it now with no complaints.