If your not running SP2, your a moron anyway.
It isn't that good, you still can't add sites to the favorites directly with a URL. And it has a few rendering issues I noticed while it loads pages up. Also the popup blocking is a little substandard to that in Firefox. It simply blocks any form of popup window, instead of just the bad ones. And some sites have both, and to get any you have to enable all of them. Microsoft have made some simple changes to it however I feel Firefox is still far ahead.