Is it the best $10 I've ever spent? Not sure. It's far from the worst. I've got the full Creature Creator now, and it's easily $10 more fun than the trial version. You can see my creatures on my Spore Site. For some reason, only my Basilisk shows up on the Spore site of 400,000+creatures (in two days) and while I'm proud of Basi, my Rust Monster is probably a little cooler.
This little guy is doing his dance...