I agree entirely. I love font icons. All the social/sharing icons to the top-right of this page are font-based.
What I was trying to do though was not add any extra weight to the version of Bootstrap I was using. I'm already weeks in to the build and have used countless sprite-based <i class="icon"> icons in the design. I wanted to keep using the same convention, rather than end up with two different ways of doing things.
As I understand the upcoming Bootstrap v3 using font icons ;-)