Rebecca:

A standard 8.5 x 11 laser cheque includes a mini advice and cheque for the user to keep as their copy. There are many examples in the sample data.

Otherwise they could print the additional form to a PDF file without DocStore but this is a lot of manual work as you have to name each file (advice) as they are being printed.

Or is there only purpose is to capture a PDF copy of a cheque then PrintBoss is much cheaper than DocStore.

On the other hand DocStore would do so much more than just capture a copy of the cheque.