Hi: I'll explain you my situation: I work in another city and I don't have WiFi in my rented flat. When I go home every weekend I can use WiFi, but not during the week. So, I decided to buy a cellular iPad Air 2 which I use for reading (lots of PDFs and epubs), browsing, tweeting, answer e-mails... Nothing related to music, photos or videos (I can do that via WiFi on Saturdays when I'm with my family at home). I've bought a 300MB ($2) plan to begin with, even though I can get 1GB ($5). However, I've detected a high data consumption and some users have told me that iOS 8 is thought to constantly sync data, even via cellular. If I had to tether to my phone via WiFi, I would have to do it for hours every day, with the corresponding waste of battery and my smartphone plan. Should I keep the iPad Air 2 cellular or should I go back for the WiFi-only model? Please, take my situation into account. If the cellular model is only useful together with very large data plans (more than 1GB or 2GB or even unlimited), it can't be for me.