I haven't used DocParser but my experience with other PDF conversion utilities is not great (Adobe, Nuance, PDFElement). The conversions don't see columns clearly with PDF documents that originate as forms, also two incoming PO's can be interpreted differently based on the dimension of the content, resulting in inconsistent column assignments. We recently used PDFElement to try to recover some GL Detail Transactions from PDF paperless office files. The import did about 90% of the work, but i had to manually align columns on the other 10%. I also noted that Detail Transactions from A/P and S/O produced different CSV results.
I was looking for a PDF conversion tool to that allowed me the ability to outline the incoming documents and assign column locations for the CSV File but didn't find it. FYI: I had to use XLSX files for my imports because of embedded commas and quotes.