You're good to go .
Anyway, my two cents: 1) if you're already an IE user, IE9 is quicker, more aesthetic and probably a worthwhile upgrade from IE8, 2) I am not a big Chrome user but I have found nothing in IE9 to make me switch from FF4.
At the present time, if I were to switch from FF, I'd most likely go to Chrome, not IE. On any system that I've used, IE (8 or 9) opens faster than FF or Chrome but surfs slower. And, I'd give up the internet if I had to surf without AdBlock Plus!