Much faster than IE7 /IE6. Test it with all those secured sites (e-banking, e-commerce) and got no problem. Only thing is once in a while got problem with java. But overall a much better browsing experience than IE.
You guys should try out Google Chrome~ Although it is still in beta stage, it is much much faster than IE and Firefox~
chrome is good too... faster than firefox, but i prefer ff than chrome at this stage :P