I really love Noteshelf. It's freaking awesome. It has a feature to ignore touches below a user-defined point, so you can rest your wrist, and it zooms into an area so you can write small without writing small. The zoomed area automatically jumps to the next line when you reach the end of a line. It supports regular text also, and has great cut, copy, and paste features. Works with the cheapest variety of touch styluses (the kind with the rubbery tips) or even your finger, so there's no expensive hardware to potentially lose.
Edit: it does support five of the major third-party hardware styluses like 53, Intuos, etc., so I mean you can use it that way too. But the Evernote and Dropbox integration and slick, easy, simple user interface really sets it apart IMHO. It's been around forever and is one of the most mature of these kinds of apps. Highly recommended!
PS it uses an OpenGL based renderer so it is considerably less laggy to write with than any of the other ones I've tried, although many people wouldn't notice a difference. I certainly do. Its colord highlighters and support for regular typed text that always remains re-editable later is awesome.
Couldn't agree more about NoteShelf. It has by far the best writing experience of every app I ever tested (a lot, a whole lot) thanks to their inking engine and plethora of tools and colours. Everything looks very smooth, organic, textured... I can't get enough of sketching with the pencil.
But GoodNotes is more productive, faster, taking less tapping to get things done, offering much more export and open in... stuff. I also need the import of pdf's right into a notebook etc. etc. Tough choices.
As it happens, I just received my new Lynktec Finetip Rechargeable Stylus. First impression, honestly, I'm not very impressed.
It takes a lot more pressure than I expected. While GoodNotes skips about 15% of my strokes and shows a wee lagging for the rest, Noteshelf is overall faster and more fluent, in brief: a better user experience. So I may well end up using Noteshelf again - unless I decide against holding on to the Apex.
Undecided for now though