I have the free version and its awesome, but I was wondering if the pro version is worth it? Has it that many great features or is it more like a "support-the-dev" kinda thing?
It depends on what you need to use it for. If you would really like to be able to change fonts and make those kinds of changes, then I would go ahead and buy the full version. Also the full version has a few other features like tilt scrolling (pointless) and resuming where you last left off.