To quote Maximum PC
"The reason we prefer Mozilla Firefox and Opera to the Avant and MyIE2 browsers is precisely because of Internet Explorer's inherent insecurity, which unfortunately affects the browser's offshoots. (tabbed browsing and nifty extensions are just icing on the Firefox and Opera cakes.) With Firefox or Opera, you don't have to worry that you might render your system useless by accidentally installing a malicious ActiveX while innocently browsing the net. MyIE2 and Avant don't afford the same protection."
After having to fix 4 computers in the past month, I installed Firefox on each, changed the icon to IE's, renamed the icon "Internet Explorer", changed the home page to their old home page, and left them to their browsing. No problems, and everyone loves the "improvements" in the "newer version" of Internet Explorer that I installed for them.
I'll be sticking to Firefox, now that I know Avant is just an IE add-on.