I've been using 16 GB cellular iPad 4 for months now and I've managed to get around just fine. I keep only a few dozen songs on iPad, I take pictures with iPhone, I only have a dozen apps on top of the pre-installed ones. However, just recently when I was trying to update Excel I got a message there is not enough space to do that, so I had to do some cleaning which resulted in 2 GB of free space. However, since all my stuff on iPad is about 40 GB I am now planning to go with 64 GB version of the iPad Air 2, and my suggestion to you is - be really, really sure 16 GB is enough. I thought so too, but installing just a few bigger apps (200-300 MB each) suddenly grew to a significant number. If you don't mind micro-managing then go for it, but if you can wait a little and spend more on 64 GB that will really take this bothersome problem off your head. Apple is really mean to keep 16 GB as the entry level on new hardware, where even light user can run through that 12 GB (space is formatted and you count out space taken by the system) very quickly and for the rest of your journey with the iPad it will be inconvenient.