I've had an iPad 1 for a couple of years. I'm about to upgrade this Christmas. I decided to stick with a full-sized iPad 4. I really liked the mini, but I prefer the larger display, not just for aviation but for the other things I use my iPad for, such as reading, e-mail and web browsing. The retina display had a slight advantage, and of course weight was a negative for the full size machine. However, overall it won out over the mini.
Now in my 150, the full size was marginal in terms of comfort. In my 172, I have no problems with it.
