So far from what I've seen here no one really OWNS one....
So let me say my word on this...
First off, I hate most apple products, I would never use a Mac for a computer, thats just foolish, they're terrible as far as computers go and what not... but I will say they're portable line of products is amazing, I've been using an iPhone3GS for a year now and I love the thing, and when the iPad came out I bought one for my mother (Who is rather bad with computers) for her birthday gift, and ended up due to in my attempt to get one as soon as possible having another that was shipped to me, and instead of returning it I just kept it.
So after a few weeks I can say its actually a very good product, I mean, as far as taking notes down I post pretty much everything here from it, and I can type rather fast on it. No where near my 100+wpm I can do on a keyboard, but I'm still if its on a flat surface hitting 50wpm+ on the thing. So I have no problem, the Pages app is great for note taking, and even the note app is rather good.
So personally I have never felt the need for a keyboard dock on it, but I can see how it might be usefull if you're in one spot for a long time typing.
The battery lasts forever, and I mean I've never had it die on me before I can, without it being an inconvience to me, get home and plug it in while I use my main computer. It can stream netflix, browse the internet, pretty much all day with no problem.
As far as books go, you can use Apples book store, but you also get access to the Kindle App, which means that you can get any book from either service, so whatever has the best price you can get it from there.
So yeah, I'd say if it looks good to you, get it.
It's made my netbook untouched.