Other than the inability to make tables (which was mentioned in another post), I miss the automatic spell check. I finally added all of those pesky law words into my Word dictionary, and then started using One Note. When I type fast, I sometimes make spelling errors, and it is annoying to keep having to go back to fix them when I was so used to Word cleaning up after me.
Everything else I love. I love how easy it is to outline, I love the tabs, I love being able to take snap shots from websites and other documents, I LOVE THE ORGANIZATION...it's fab. I wish more people had OneNote so I could use some of the more advanced functions.