as a long time evernote user, so much of my life is in there. So far I don't see anything compelling yet to even get me to open up the new notes app.... let alone switch.
<rant>
This situation reminds me of ichat. I never liked it. Instead I used adium as it supported multiple chat services and you could reskin it to have a much smaller visual presence on the display. iMessage integration with the phone and iPad was the killer feature that made leaving adium worth it.
apple tends to release things in stepped feature sets. Often times the initial release of software or hardware isn't the best implementation, but the starting point. It is the second or third generation that raises some eyebrows and challenges the status quo. Don't get me wrong notes will soon give evernote a run for its money. But as of now there are too many things that notes isn't even competitive about at all.
That said, for many people, it being a huge improvement over the old notes app is good enough.
</rant>