My friend let me borrow his 28mm lens, and my god, I loved it. Great wide-angle shots, (both stills and video), so I decided to scout around for it, and managed to buy a used one for a great price. And in speedy time too! Nicely packaged!
Starting off with my kit lenses (after purchasing them and my 550d last year), I have now progressed and have this little beauty in my arsenal alongside the 50mm f/1.8
Fixed aperture lenses (such as this one) is great for what I'm going for. Creating short films, involving a variety of creative shots, without having to worry too much about working lighting around the camera.
Picture quality is top notch (it's a Canon lens, what else?), and if (as a Film Student like me) you have the sort of money (bargain or otherwise) to spend on a great lens like this, as well as the 50mm, then I would go for it.
Can't recommend it enough!