99% of the tasks you would want to do with your fingers will be easier on an iPad and 1% will be easier on this ModBook. (Things will be different once you plugin a keyboard.)
With dictation coming to mountain Lion, typing shouldn't be an issue... And you would be doing most of your tasks with the pen. I've seen this product before. They have software that you literally write stuff with your own hand writing and it's read and typed into the field. It's pretty neat. Plus people won't be buying this to be doing stuff requiring a lot of typing or navigating but rather drawing!