I tried the demo, thought it was pretty cool. How many out-of-the-imaginary-box levels are there? And I know there is limitless potential with the online sharing feature.
The game is pretty cool. I want to get it sometime... I'll probably get the PSP version because it doesn't seem like a game to play on a big TV, seems like a more portable puzzle.
I'm gonna buy it come payday but 1up Yours said it had a few bug issues, as in the game sometimes doesn't listen to it's own rule. Still said it was worth the $10 though. It looks awesome on a big 1080p set. Super crisp.