Yeah i really like it.
This technique allows you to go fast wit great results. I like it because it gives you the airbrush look without the headache of setup,cleanup and paint mixing and etc. I have 2 airbrushes and know how to use them very well but i barely use them if ever. Once you done this pastel chalk tech and get the hang of it(which isn't hard)and have reference pics to go by as you work its alot of fun really. If you don't like it you can take a wet towel and wipe it off and start over.
I was taught this tech by a pro model minature builder and FX guy (Carl Horner) that works in Hollywood in college days many,many moons ago. He the underwater minatures for the Abyss. Great guy, had alot to share in different techs. And alot of cool stories while workin on different films.