I like that it is compatible with Bootstrap. Also, I find the icons to be extremely helpful, as they are just what you need for your website. The font choice can be awkward sometimes, but this goes away once you start using them. I don't really have anything bad to say about Glyphicons. It's very useful and easy to implement in my projects. I would recommend getting it if you're looking for icon packs that are compatible with bootstrap. We're making an app where we need some icons, and Glyphicons fit perfectly!