Looks nice but... What does this get me that the inbuilt comparison feature of Word doesn't do, apart from making me give you copies of all my legal documents?
Not all versions of Word have a comparison feature, and when present, it's not very easy to use. Track changes only works if all parties use it, it can't be turned on after the fact.
Even if track changes has been turned off, you can do a comparison between two documents that results in a redlined document. Not sure what this does other than make a pretty redlined document.