Me? Sure. That OS gives me the functionality I need, and if I have to buy a specific device for it.. that's fine. It's not the only tablet available though, so the iPad's real usefulness, to me, is for watching video only, and minor surfing.
I want more touchscreen controls, though, so while Surface Pro greatly appeals to me, it is not high on my list of wants right now. However, build a decent Wacom tablet into the top, charge me $99 more, and I'll buy one this instant.
In my house, even my cable box runs a Microsoft OS. The seamless integration...you only get out of using a complete platform, and I'm already a Windows user, not a Mac user.
If I had a Mac, and an iPhone, I'd buy the iPad, most likely.