One of the main reasons I use it is that it combines most of what I like but is spread across other preprocessors.

The option to make functions that take places of properties is amazing. ie. border-radius: "child" $parent-radius can actually be calling a function like border-radius("child", $parent-radius) where using border-radius: 4px would just implement the standard expected result.

Add in my favorite selector: `^[-1..-1] to get the last raw selector in a nested situation. (its like magic in combination with BEM naming syntax)