Their invoicing system may well be quick, convenient and what-not, but the actual example seems to me like any other invoice, not in any way "more professional-looking" (I believe that there are not so many ways to write down an invoice BTW) and allow me to believe that (as in the posted example) if you send an invoice:
Document Date: July 6, 2017
Due Date: July 20, 2017
it is not likely that it will be payed much earlier than July 20, 2017, particularly if the Billed to is a firm.
The whole stuff reminds me of Calvin&Hobbes and the secret weapon that no teacher can resist:
