FOP 0.91 Beta - How good is it?

Does anyone have experience with the FOP 0.91 beta 
(http://xmlgraphics.apache.org/fop/0.91/)? How good is it? How well does 
their RTF support work? Does it work with diacritics?

Is it anywhere close to being in the same league with RenderX or Antenna 
House?

Jonathan

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