IMO, it would make more sense for the PW2 to count how many PW2 screens of text are in a chapter/book. That way you would get a better feel for how long you have left to read. I understand using page numbers associated with the printed version of the book if they are available, but when they are not it makes little to no sense to use arbitrary page numbers that represent x.y number of screens of text. I understand of course that calibre cannot predict how many screens of text will be required on an eInk device because each device is different and each person can set the text size. But the PW2 should be able to easily determine how many screens of text are in a chapter/book based on the user's current settings and give a proper number of how many are left. I can predict how long it takes to read one screen of text, but predicting a page based on say 3.4 screens of text is not going to happen.