15 Years CSS Experience
I began using CSS in 1997. Of course back then, support for it was very limited. It wasn't until about 1999 that CSS support was better. But for me, it's all about CSS3.
All by Hand (with a little Sass)
While I was using Stylizer for a while, I have found that programming CSS3 by hand is far more efective. And since I do it all in Sass, I'm able to maintain much larger CSS files with excellent structure & readability.