My experience of IE remains grim. Most recent major issue was when I tried to use the diagnostics in IE11 it crapped out irrecoverably. Uninstall/reinstall didn't work. I had to revert to v10 (or sacrifice hours, unpaid, to properly investigate and fix). Developing for web I still need to test 4 browsers (and multiple version of IE) and it's usually IE that causes grief. The automatic (and Windows version independent) version upgrades for FF & Chrome at least mean I don't have to check my stuff works in 6 year old versions. IE11 may be MS's best yet but there are still unfortunately many users on Vista & XP and stuck with older IE versions
Funny how nobody's mentioned Safari & Opera...!