This is a must-have for any Ubuntu user! It's the only way to get the useful Window Snapping on Ubuntu, since this won't appear in personalization settings in Ubuntu (even in 13.10).
Also it's the only way to install new themes and cursors in Ubuntu (See Softpedia Tutorial for how-to).
This Unity Tweak tool should be available by DEFAULT in every Canonical release, specially for new users that want to get into Linux but are used to Windows and don't want to go through obscure command line stuff to do simple tasks like these.
The only reason i'm not giving it a 5 is precisely because it still needs a Tutorial for new Linux users to install themes/cursors.