Now, we are working with the metadata for PB. Afther that I hope the next work in PB from our team will be to make better how looks like the PDF afther the exportation from mPDF.
Maybe prince looks like better, but maybe with a litle of work, mPDF is not so bad after all. For me is cheaper to spend some hours of work making better how mPDF pdf´s looks like than pay for prince.
(Our team have not too much experience with wordpress, that´s why we preffer to work just with easy tasks, I believe we could make better the export experience with the CSS and some new setting but not to update and make better the plugin itself)