I still use my iphone when I am on the move, because it is easier to use and keep/whip out with one hand, and a lot less bulky compared to the ipad.
The ipad is more when I have the opportunity to sit down, so the extra bulk isn't so much of an issue. For example, if I am sitting down marking my books, I may prop up my ipad and run shadow era (an online CCG).
I can't imagine any situation besides surfing in a chair that the iPad does better than any of these devices?
If you surf a fair bit, that reason alone makes all the difference. For me, the ipad is my backup when my dad needs to use my imac for his work.
😀
There are also some cool combos you can use together. For example, if you have airdisplay, you can use the ipad as a 2nd display for your macbook.
In short, to quote Steve, the macbook already does most of the things your ipad will be capable of doing anyways, just not as well. I won't say it is a waste of $700, but again, it ultimately depends on how much you really need that money.
I have friends who went with the entire mobile package - 11" MBA, 15" mbp, iphone and ipad, and he uses them for separate purposes. MBP for work at home, MBA for when he is on the run outside, iphone as a phone, ipad for relaxation at home, and icloud to sync everything.
🙂