Here's a question: what's the difference between this icon font, and font awesome, which for a time looked to be the 'go to' way of doing icons? I have no horse in that race, and they both look good to me.
First of all it's not a clean swap, because the class name structure has changed. Secondly, the font glyphs seem to have totally random positioning, so depending on how you use them you'll need to tweak the css for each one (or certainly groups of them) so they align properly with the text/button/whatever.
I reverted, and dropped in Font Awesome. It was as simple as changing one line of css if you use the CDN, done. No tweaking required, and there's load more to choose from.
I'm using Font Awesome on one of my Bootstrap 3 based sites because it has more icons.