Rockbox happily made it through the New Years Eve gathering without frustrating anyone with its occasional rough edges. However I am having problems with .m4a files (unlocked iTunes files) causing Rockbox to throw a strop. Unfortunately debugging is made harder by the inability to attach the very much copyrighted tracks to the bug report. I don't know how much love the m4a playback routines have seen. I assume most right thinking developers mainly run Oggs and Mp3's which of course work without any problems.
My hunt for un-encumbered test media continues.