I’m using Art Studio Pro since last year got to buy iPad for a job I was offered. I was looking at different iOS apps, tried most of them, used some, but enjoy ASP the most.
I live in London where I work for advertising industry drawing storyboards. I also do comic books published in Poland and my recent one in France as Miras.
Recently I used ASP to paint a cover for the second volume of our comic. Honestly I find it more convenient and comfortable to work in than Photoshop. I moved my design to Photoshop only because I could work on bigger screen than tiny iPad.
Art Studio is the best painting/drawing application around. Keep up good work!