Since it is possible that a customer receiving only images will receive an image of a substitute check, I think an education piece is a very good idea. However, I do not think the disclosure authored by the Fed serves that purpose at all. As Bill notes, it does not apply to all customers; i.e. it describes rights that not everyone will have. In addition, it's simply too d*** long for anyone with a life to read on a voluntary basis.
Look for or develop something short and sweet that simply explains why some of their checks may look different or be a different size. Answer the questions they are likely to ask and skip the legal brief.
_________________________
In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.