I love this app. As a sculptor I find I need to work out ideas regularly on paper and this app allows that flexibility without using said paper. Since my iPad replaced my sketchbook as a constant companion, this mostly fits the sketchbook bill. Now, my only complaints are few but fairly major. A. Graphic chip acceleration: if it's in there it doesn't feel like it and I am running the newest retina iPad. And B. It's not the most intuitive interface and the gestures frequently leave you accidentally drawing on your sketch. Fine, hit undo.....but, sometimes undo just stops and you can't undo what just happened. I don't know how the bug that causes this works but I suspect that during a gesture, the app thinks the page has been either left or zoomed out of and it resets the undo buffer. If these problems could be alleviated then I would up my rating for sure.