Out of the box roots comes with a mix of jade for templating, stylus for css pre-processing and the axis library. I removed some of these defaults in favor of a jade, skeleton, and sass combo. Stylus did seem tempting but i preffered to work with sass for now.
The development team for roots.cx has moved on to Spike which uses webpack for some of the dirty work. I've used webpack a few times before and it continues to make gains as a swiss army knife of module packagers. I will take a closer look at Spike and Webpack for another project.