Working on a Coffeescript project together with node, I figured stylus would be an awesome addition, for an js-only stack. Began out all nice and fine, one thing bugging me was that syntax highlighting was horrible in ST (if you know of a better package please let me know). As the project grew I encountered very annoying implementations when using the arguments keyword in mixins (box-shadow I am looking at you) and I ended up adding nasty if constructs inside my mixins. Stlus was getting annoying over time, at first I thought it to be the liberal kid on the block — who needs braces/colons anymore? But it turns out the highlighting could not figure out what was going on, and me neither. As the project grew, I started missing my braces.

Compared to sass/less, sometimes I needed to build before I knew if something worked the way I expected, in addition visual clues are non existent and comments were needed to identify structure.

So in response to this comments, stylus is quite nice, but it needs some rules, especially for bigger projects, because it does get messy. And last thing, I wish it was more like Coffeescript, at least use # for comments stylus and you make my day.