Harp is awesome. Only missing two things my workflow has grown accustomed to -- Compass and livereload. The former would be available eventually on top of libsass... The original sass syntax could arrive perhaps sooner. All this because of the yet incomplete feature parity between the Ruby and Node versions of Sass. For now it simply makes more sense to compile styles with Ruby / Compass. It appears livereload will happen as well. I just couldn't wait for either. Gulp automates the extra step of compiling to css and live-reloading any changes. Building sites for static deployment is another possible use. Have a look at its plugins for ideas.