It's much better when you don't have to run it windowed!
Make sure people report back that it works, so it's not one of those freak things that only happened on my computer, lol.
Performance gets a boost for me, as well, because I have an x2 and in windowed mode, it only uses one core, but in full screen, the ATI drivers kick in the second core

They might still only tick over 35 - 40% but at least that's on BOTH cores, not just one.