Blue, I tried SuperSoil a bit last year, but finally decided it just wasn't for me. First off, you'd better have a strong back and be capable of maneuvering full bales of peat, and big bags of perlite and earthworm castings. Then you need a place to mix all that stuff and you need covered tubs big enough to allow the mix to cook, plus you also need room to store all the peat, perlite and castings that you don't use. Then you need room to store all the millions of bags of other organic stuff that you need. In other words, SuperSoil really does require that you have plenty of covered storage for everything. And though SuperSoil might save you some money over the long haul, it takes a whole lot of money to get started.
I'm not saying it isn't great stuff; it is, but I'd say SuperSoil is pretty much limited to people making a decent wage who either own or rent nice sized houses, rather than for people who live in Mobile homes, apartments, or Mom and Dad's basement and work for crap wages.
Coco is way less money than Supersoil and if you get the compressed bricks, you can store enough coco for several grows in very little space. And the other thing, of course, is the fact that yield is directly related to size and coco definitely grows larger plants than soil does.
My next grow will be in coco and I'm excited about it.