No rating given, since this is beta software, but I tried with a swf file from http://www.storyofstuff.com/, and didn't get very good results - no audio, some video elements missing.
Also, there are no controls (i.e. fast-forward, rewind, skip to position, etc), which is the reason I tried it in the first place. And it crashed on me the first time I launched it.
Swfdec
alternative Flash player
Version: 0.8.0b1