Spore

Has anyone checked out the computer game Spore yet? I don't tend to be much of a gamer, but I've read several articles about it this weekend and it looks interesting. Plus, "The Sims" is one of the computer games I fell for hard, so I'm curious about this new game put out by the same person.

I'd be interested in anyone's observations or critiques. I'm seriously debating whether or not I want to buy it. I was disappointed to find there isn't a free demo to try on-line or anything. I'm worried I'm not quite as interested as I think I am right now :).