i've never heard of it, but i just took at a look at the website that sells it. i have suffered with some back pain too, and i like the idea of not having to deal with it anymore. but (and this is just my opinion), i don't think i would ever buy the bulletproof back system. i see a chiropractor once a month, and he makes sure i'm aligned and doing well, which helps with any pain i experience. also, i found that i could strengthen my back pretty well just doing the exercises people talk about here: pull ups, deadlifts, squats, planks, etc.
personally, i harbor some mistrust toward people who sell a cure-all or fitness secrets online, but aren't willing to give any more information than their friends' testimony. his website is long with a personal story, a few photos, and an unbelievable sale on his product...but there isn't really any useful information on there. and there are so many websites like his. i get that people need to make money and these are sales techniques, but the information they are selling is free and from better sources, one of which is MDA.