Right there with you girl! No Way either of my diffusers (or any of my future diffusers) is going anywhere!
You know I swapped out the Curly Girl book..I don't remember what Lorraine says..but since she used cones not sure I'd care much anyway...BUT I think the general consensus seems to be use as little heat as possible.
I don't think though, outside of flat ironing (or cooking your hair as I like to call it) anything else with heat is mentioned.
I do think diffusing is part of the reason that my hair can tolerate the level of products I'm using..because I'm so dang porous it really dries my hair out if I don't use more, thicker, heavier products...does that make sense???