I really don't like the "big brother" that Apple is trying to become. Their products are good, however. I love my Iphone. I really don't have much use for a Iphone that doesn't fit in my pocket, which is an IPAD.
However........
I work for a Chinese carrier flying a scarebus. There are only Mandarin FCOM's in the cockpit. I tried FCOM on my Iphone with Goodreader and it was great, but too small. So I bought an IPAD. It absolutely rocks for FCOM, using Goodreader PDF reader. Far better than the paper (which is an abortion). I can reference info in 1/3 the time it took with paper manuals.
Highly F@#$%ng recommended.
PS. I don't personally use it for anything else. It doesn't fit in my pocket, and at home it is not as useful as a laptop or PC. IMHO.