It is a complete aftermarket
ECU. Does spark and fuel. It will do boosted engines no problem, it even comes with 2.5bar map sensor which is good for over 20lb of boost. If thats not enough you can fit bigger ones.
Hard to say what it is comparable to. It has relatively small tuning table size compared to many other
ecu's (same as base model aftermarket
ecu's), but so far I cant see that I would ever want more tuning points than what it has. It does have heaps of supporting software, realtime tuning and datalogging, good after purchase support through forums, its all open source so if you know your way around a programming language you can write your own functionality in.
Looking through the success stories in the MS forums youll see it fitted from everything from 5hp 2-stroke lawn mower engines to supercharged 4.6L mustangs.