I've never formally used this, though I've tried "non-method" methods

plenty, as well as having recently talked with another local teacher about this precise method. I think it's based on shapes and patterns, and the one drawback she said there was is that there is really nothing about technique being taught along with it (though I think they are trying to change that). I read a website just now about it and while they mention the many things you will learn by using this, technique is never mentioned. If you are wondering about "reliability" within in a method of learning, I would assume it matters to you whether or not you are learning about technical matters.
When I was talking with this woman about it, I was interested for the sake of possibly teaching those (many) who seem interested in anything BUT traditional lessons. However, my studio has gone a different direction and while I bet I could use some ideas from it, I don't think I would use it as a strict method. Other than that, I don't know much about it.
Especially if you're only wanting a hobby, why not try it? There is a chance that if you are working with the head professor, she would also be able to include technical work, and who knows? Maybe she will be extra inspired to work with you since it's a new method for her? I will say though, generally I am a bit suspicious of methods which claim they will be having people playing all sorts of repertoire on their first day. I'm not ruling it out as something of value, but it's not going to be the whole enchilada if that's its biggest claim to fame. Perhaps you don't care much for enchiladas, though.