ive compared it to a BM and as Admiral Toad pointed out the major differences are the mash re circulation direction and degree of programable control.
the BM system will ensure a mash will never stick as its bottom up and rests so gravity will drop the grain between cycles, the grainfarther solution top down requires a good effective whetting and doughing in to guard against a stuck mash, so should not be a problem if the grain isnt too floury..
the control difference.. give it a few months and alternative BM arduino controllers will probably be modded to control this beast too, there are 2 alternative BM controllers im aware of both built and specked by Aussie brewers, i can provide links if of interest, but a quick browse of a few aussie brewforums will reveal em..
Matho's build is so well documented it includes instructions for making your own pcb's if you dont want to use strip board, and even includes info on how to use an iron to transfer a printed panel face onto an abs plastic project box..
if not the current work going on hacking the stc1000 controller into a mash controller looks like a very viable alternative too..