The keyboard does feel very similar to the new MacBook keyboards-- each key only drops a tiny bit, making for small, quick movements. The keytops are completely flat, or at least so much so that I couldn't feel any grooves or contouring. So if you like the MacBook keyboard, you'll probably like this one. I, however, am in the Model M crowd-- I like my keys big, deep, and clicky. I like to feel like I'm actually punching out words when I'm, well, punching out words, and so I like a keyboard that has a little heft to it, a keyboard that can chop a melon in half.
Actually, the Keyboard is probably thin enough to do a little fruit chopping, but in terms of really feeling it, I couldn't. I'm sure if I had more time with it, I'd get more used to it. And I was extremely impressed with the way the keyboard itself was built-- just like the iPhone (which I spent way too much time playing with in the store yesterday... again), it's a slim, well-designed, very functional*, beautiful, amazing thing.
It's just not my thing. If I got one with an iMac, I'd probably use it and learn to love it. But using it for the 20 minutes or so I did yesterday didn't convince me to replace the keyboard I've got now. It's a great keyboard, it's just too darn thin for me.
Have you guys bought or used it yet? What did you think?
*The only other problem I had with it was that, even in the Apple Store, the dedicated keys didn't do what they were supposed to-- an employee told me to go into settings and change all the hotkeys, which is obviously not what should have happened. But I believe that exact problem got fixed this morning, so it's probably not a concern any more.