I've been trying out sketchbook pro on PC and it has a few very useful tools that merit the $60 price tag. But the lack of navigation controls is killing it for me. I really can't zoom in on an area to work on details if I can't see the big picture.
I can see why it's so popular on tablets though. Pinch and zoom would make it easier to navigate.
Anybody have any advice on how to get comfortable with the navigation problems?