I tried with IE9 final. a few more things passed but a lot is still broken. They should probably update the page to reflect that its IE9 final and not one of the betas. still not great.
I actually just installed it because of this. I haven't used Opera in years and am excited to try it again.
Surprised also by Opera doing so well.
Opera has always been ahead on forms, they had implemented most (possibly all?) of Webforms 2 before it became part of HTML5.
Yes, all these new form features are a massive boost for consistency and usability of forms on the web. Opera is often ahead when it comes to web usability issues like this. Great work, guys.