* First impression: Nice tutorial, nice animations when picking a notebook. Great idea to do your app planning sketches as its own notebook.
* First impression while writing: Nice inky strokes, I like the colors.
* Second impression: Hmmm...this seems a bit laggy compared to Noteshelf or Penultimate. <flip over to those programs> Yup, definitely laggier (I have an iPad 2). Probably only a few milliseconds lag, but noticeable.
* Third impression: I like the rewind interface instead of an undo button. Very cool.
* Fourth impression: No zoom or magnifying glass? bummer.
* Final decision: Nice, impressive, innovative UI but unfortunately especially the lagginess will cause this to not replace Noteshelf as my default go-to notebook. The lack of zoom is also a bummer, since with a magnifying glass you could add so much more detail, it makes up for the iPad's lack of pinpoint accuracy.
3.5/5 (edit: just realized i'm not on the app store so I can give decimal ratings :P)
P.S. Also, a "hand guard" area to ignore touches as in Noteshelf would REALLY be nice to be able to draw without having to make sure you never touch the screen with your hand while drawing.