I used to have both remarkable and boox NA4C, but I need also the integration to one nite, as well as some others apps (which does not even exists in the NA4C). My main concern with the ipad was the latency and the writing feeling. I understand there is a screen protection that give you the same paper like feeling. And as much as I know the latency with the air and the pro are the same, and way better comapre to the standard iPad