Describe what you like and dislike about the CSS preprocessors you have used.

Likes

• Mostly the advantages mentioned in "What are the advantages/disadvantages of using CSS preprocessors?".
• Less is written in JavaScript, which plays well with Node.

Dislikes

• Sass relies on node-sass, which is a binding for LibSass written in C++. The library has to be recompiled frequently when switching between Node.js versions.
• In Less, variable names are prefixed with @, which can be confused with native CSS keywords like @media, @import and @font-face rule.