I just installed IE9 this week, and what an improvemwnt over IE8!!! Totaly revamped. It took some getting used to, but I think I'll keep it. All the functions/controls have been moved around and redesigned to allow a larger 'window' for each web page. The address bar and search bar have been combined, now just type your search in the address bar.
I give it Two-Thumbs-Up for speed, which seems to have improved.
I'll update again in a week or so....
Anyone else try IE9?