[michaelbuckbee]

Minified, Fontawesome is 21kb - which for a single HTTP request [1] the ability to use all of the icons at any size and color and have them look fantastic (for values of "fantastic" that mean no jaggies).

It's incredibly convenient not to have to generate multiple sizes of icon/pictograms for a project. Beyond even just needing multiple sizes for different uses (a list vs a header) - with the advent of high dpi mobile screens you'll also need to re-generate all of the images in @2x versions if you want the images to not look fuzzy.

Beyond that, there is now a whole ecosystem of addons that make use of the library

One of several different icon pickers: http://victor-valencia.github.io/bootstrap-iconpicker/

Leaflet Map Markers: https://github.com/lvoogdt/Leaflet.awesome-markers

1 - BootstrapCDN will even host it for you: http://www.bootstrapcdn.com/#fontawesome_tab