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Hi,
I've used them but I finally suppress both print and pdf.
PDF was cancelled because it takes to much ressources from server : when the website gets little popularity, PDF takes too much time to process.
There was a few month, I suppress every print functions : it makes DC (duplicate content) and Google seems to index better the print page rather than the full page... It's a problem to get some smart positions in SERP; and finally, you don't "catch" the visitor to your site : he goes away after viewing the print page... It's not good enough.
That's my opinion, and just mine.