I've been using Internet Explorer since about 1996 when it was shipped with Windows 95, as version 4
I've been quite happy with it's over all performance, until version 7
As a result I went back to version 6
I waited a further few months, reinstalled version 7 and although RC1 was more stable I encountered other issues
As a result I have no intention of upgrading to version 8 on this machine running Windows XP
However, the laptop I have with Vista works fine with both version 7 and 8 of IE