I don't find the products to be curl enhancing, they just are water soluble for those that want to do CG.
I get a deva cut from a curl consultant and I would say that my hair just has a better shape from it. It stays in good shape for longer and that means I can go longer times in between cuts.
2b/3a, primarily use Jessicurl and DevaCurl products, Curls Hair Tea conditioner and various gels. I'm modified CG-ish since 5/04.