Originally Posted by DaleDe
When you say "most" have a back facility, what do you mean? If my most sold then yes, the Amazon Kindles have a back button. If you mean the most models then I would disagree. Where does your data come from?
Of the reading devices that I've owned, the only one that lacks a "Back" function has, I think, been the PocketBook 360, and that was apparently a firmware bug. Every other (various Kindles, various different Sony devices, various CyBook devices) has had it, either as a button or via a menu.
EDIT: Just remembered that my BeBook Neo also has a "Back" button.
What devices lack such a capability?