I have been using IE8 during the last month testing W7 and I have been telling all my friends one thing, I have been using Firefox for the last 4 years, I have tested Chrome and Opera, and when IE8 is finally released that will be the browser that I’m going to start using full time. I’m very pleased with it performance and it gives me almost all I need without having to install any extension.
Today's browsers all perform well, and in the real world, you don't actually notice a performance difference between any of them. (I saw exactly this when I looked at the supposedly superior Safari 4 beta.) What matters is what the browser brings to the table in the form of security and functionality, in how it makes you more productive on the web.
Apparently I’m not the only one thinking in this way. Today Paul Thurrott has posted a note commenting about some tests done in another site and he fills that IE8 is as good as all those other browsers that claim to be the best.