One of my favorite features of LESS is the ability to simplify my CSS rules that are deeply nested by using LESS to compose them more simply. I like this feature because it gives me the ability to clean up messy CSS files and make them more maintainable. Take a look to see what I am talking about.
You can view this excerpt from my Pluralsight course covering Web Debugging with Firebug, Fiddler and more. If you want to view the entire course, you can find it here: