This tool saved me when I had to clone a few deeply nested bits of a site between two projects with completely different stacks.
Paid full price and was very much worth it: saved me hours of untangling the horrific CMS-generated source CSS. I just plonked it in the destination and went on with my life.
Now I use it from time to time and it's a nice addition to the built in dev tools.
Congrats on the 3.0 release!