I have had the good fortune of having Harold at Boxcar Press convert
my PDF files into plates and they came out wonderful. Most recently
I had him print a piece for me from a PDF that I created in
PageMaker 7.0 with Adobe's Minion typeface and it was brilliant.
When creating PDF files just make sure you review the settings so
that you don't compress the fonts. (I don't know if that makes a
difference, but compression just seems like a bad idea.) I think
Harold offers some guidance on his website (www.boxcarpress.com) for
submitting files. Hope this helps!