Pages and Numbers both work great, for what they are intended for.
I used them both while I had my iPad but found myself wanting a keyboard when I was using both of those apps. My note taking would sometimes evolve into a bit more and the iPad would get funky trying to type in some situations. My solution, sell it and get an Air. I did the first part but have yet to pick up the Air.
I think the iPad is great all around and good for notes but anything longer and the wrists start to hurt. Atleast that is my experience. 😀