Master one???? Yikes. Where would the fun in that be? There are a few Ultra fractal masters here, and their work is stunning. I plunk between Fe, Apo and Xenodream.(oh, and Terragen for Mixed medium stuff) I doubt I'll master any of them. You learn a lot by playing in assorted programs. Perhaps the purists will say otherwise, but that's how I feel. Most of all, have fun! Miriah