I started using LessCSS back when SCSS didn't exist, so it was a choice between SASS' brand new, backwards incompatible syntax and Less' "progressive enhancemen

I started using LessCSS back when SCSS didn't exist, so it was a choice between SASS' brand new, backwards incompatible syntax and Less' "progressive enhancement" philosophy. Since then SASS has grown the SCSS syntax, but haven't really given me a reason to bother switching. Also: Less now has the even better less.js, which is handy for quickly throwing together less stylesheets and really fast on the command line compared to the old Ruby version (an order of magnitude faster for 4,000+ line files).