Thanks everybody for your input.
You are confirming some things I suspected.
I will definitely try and get as many e-reading apps to test my product.
Originally Posted by DiapDealer
I can assure you that "pages left in chapter" is not any sort of standard ePub functionality (ePub meaning ePub2... which is what Sigil creates).
Good to know. The Nook does that as well, though.
Originally Posted by JSWolf
Do you actually have a proper ToC in the ncx file or are you just doing it via a list of links?
Both. Yes, those chapters definitely exist.