For some reason I still use Internet Explorer as my go-to browser. It's been the one I used since I started using the computer. I know there's better ones out there but continue to use it by force of habit. I'm probably gonna remove it from my taskbar and get into the habit of using Chrome or something.
Only if you dislike the IE interface. As far as I know, IE 10 and 11, 64bit versions, are unmatched in speed.