Everything about this app is excellent. All the transitions are really instantaneous and latency-free!
Unlike Apples Notes app, the keyboard latency here (something important for fast types) is also excellent. Theres no lag between a letter press and its rendering on the screen. This is not a small achievement.
My only issue with the app is that in the iPad landscape mode, vertical screen state is very precious. When using iA in landscape, the extra keyboard bar takes a very precious area of state. Combine this with the fact of big fonts and line spacing used by iA (which are lovely), and you get only around 8 lines of text to view while writing, which is quite limited. I wish if an option to minimize (or remove) their keyboard bar exists. A small gesture to minimize that tall bar down would be enough.
Darwi07 about iA Writer