>As the other reply said...non-working shortcuts and also no mouse cursor. You have to continually lift your hand to the screen to swipe or press, or click/double click the home button (hopefully you have the iPad positioned securely or you'll have another frustration on your hands).
Well, I don't normally use the mouse when I'm writing a document. I even prefer full screen, full focus mode in writing apps like iA Writer and Ulysses (also on the Mac).
That said, most shortcuts one would use for writing work just fine (select all, copy, paste, etc). And more from what I see here: http://www.laptopmag.com/articles/every-ipad-keyboard-shortc...
When I needed it there was also no splitscreen, which I acknowledge would make things easier. The situation might be better now, but my sour experience forced me to move completely away from Apple at the time.