I gave up on note taking apps on ipad. easier to take notes on a page and then taking a photo of it with iphone, ipad if you do not want to keep paper notes. Simply from practical point of view. Unless if you want to annotate on pdf notes, so that you do not need to print them. Then it would be more useful than just taking notes.
Did you try Note Taker HD? I find it very useful and easy to use.