I've played with it for only a few minutes, but have fallen in love with the delicacy of line you may achieve. And there are lots of tools that I haven't begun to play with yet. Thanks, Jen, for the link!
Did I mention that I probably will be buying a drawing tablet for the computer this week? My brother is going to let me take a test drive of one that should arrive on my doorstop tomorrow. I'll be giving it a try at the "One Motion" site, for sure.