I just joined a Gem and Rock Club, and learned how to use a different machine. I bought this "cheapy" to use at home and so far: AWESOME! The 0.05mm Mast marking and adjust is great. The Speed adjust, water supply, and machine seem pretty solid (I did have to put the control board together as it was damaged in shipping, but it was just "loose"). I bought 320, 600, and 2k lap disks because I'm starting on Quartz (1k is really slow). It doesn't have a "cheater", but it does have a hard stop. Like the previous reviews, fine (0.1 or 0.01 degree) angles are not really possible (without a great eye). Honestly, from what I can tell, that is part of the art of it anyway. Quite pleased with my first quartz stone finished at 2000 grit (will get 3k anyway, for ruby). Removable plug for 90 degree girdle grinding is great, as is the 30 degree dob holder for doing the perpendicular table cut (at 60 degrees on the mast). Water adjuster could be finer (is pretty hard to get drops instead of stream). For the price: 1000% satisfied. I don't know what more a $3000 machine would do (besides the fine angle control).