[jaysonelliot]

There are already dozens of tools for Windows that do side-by-side diff comparisons, not to mention the fact that Word itself has a side-by-side comparison tool in Windows, but not Mac.

The reason this tool is worth $99/year to someone like me is that I need it for publishing, not coding or simple business document comparison. It's a nice thing to have if you're an office worker, but not vital, and probably not something you'll be able to get your boss to pay for.

In the publishing world, on the other hand, it's a critical function that would save untold hours of paid editors' time.

For anything other than publishing, there are "good enough" tools already out there. It's very surprising to me that it wasn't developed as a Mac solution first.