>How accurate are the sketches?
In general, sketches with Inkling will be accurate to within approximately +/- 0.1 inches (+/- 2.5 mm) in the main drawing area of an A4 page, and within (approximately +/- 0.2 inches (+/- 5.0 mm) at the edges of the page.
2.5mm is quite a large fuzz factor. Enough to make me think this could be great for very-rough sketching / outlining of a design, but not enough for replacing scanning / doing (essentially) OCR.
If you check out that review it shows that the product definitely needs to mature. I can't see the wacom one being used for professional purposes until they up the accuracy. I was going to buy one for my finance for her birthday (she has a cintiq but wanted something for the go) but decided it wasn't worth it.
On top of that inkling requires that device to help read from the paper which limits its usefulness some (for me at least).
Hopefully they improve on it because it's definitely an interesting approach to this problem.