These guys are correct. Theoretically the page numbering is supposed to correspond to the page numbers in the print edition so that the reader of either the ePub or printed book can reference the same material with the same page number. But I doubt it is really that accurate. Sony ePubs are supposed to be hard encoded with page identifiers, but that is totally up to the publisher. If the ePub doesn't have hard encoded page identifiers then the reader's firmware uses a math algorithym to estimate page breaks. At any rate it is annoying not to be able to turn it off on the 300, but at least they don't show up on the 900.