Synfig Studio: Open-Source Animation Software

Synfig Studio is a free and open-source 2D animation software, designed as powerful industrial-strength solution for creating film-quality animation using a vector and bitmap artwork. It eliminates the need to create animation frame-by frame, allowing you to produce 2D animation of a higher quality with fewer people and resources. Synfig Studio is available for Windows, Linux and MacOS X.

 Has anyone ever used this? There's a lot of amateur stuff on the demo reel and some Fanime but nothing buy a trained animator.

That isn't a knock against it, just what I can quickly see. Does it have the potential of Toonboom or Anime Studio? I need to give this a serious look.