My CFI at first seemed rather dubious that when she asked if I had a current FAR/AIM, I produced my iPad and said "sure I have an app for that!" She feels I need an actual paper version, which I'm not specifically against, but when she asked me something obscure about the regs, and I just typed it into the search block in the app...well, I'm not sure if she was pleased or not. I just got the feeling that she's distrustful of technology, which generally is not a bad thing, but it's easy to slide from general distrust to downright antipathy. It was rather like she felt that the "big book" was the only legitimate version and my iPad version was something analogous to Wikipedia or something (note that I, for one, love Wikipedia, but understand its limitations).