DWT vs GtkD

[JN]

DWT vs GtkD

Wiki (http://prowiki.org/wiki4d/wiki.cgi?GuiLibraries) claims
they are both "mature and ready to be used". How true is that?

As for my requirements - I'd like my app to run under Windows and
Linux, also it would be great if it was compilable under GDC. D2 
of course.

I am deciding between these too at the moment and would like some
opinions. Mostly which one is more mature and whether there are
some important components that were dropped during the porting
process.