I would like to give you my own first impressions of the creator but I can't. I haven't got near the game while my wife and two daughters create an endless succession of cute creatures. What I can say is that the user interface is a stunning triumph. My wife is someone who normally refuses to play any computer game without me at her side to tell her what buttons to press buut within 1 minute of sitting in front of spore she was already creating her first creature.
I really think this game may hit that niche that made the Sims such a phenomenon. I have one fear though. From what I understand the full game will throw your beloved creations into a survival of the fittest fight for existence. Judging from the specifations on many of the body parts combat seems to feature strongly. I suspect that there are a lot of folk out there who just want to make cute cuddly creatures and these folks may be severely dissapointed if they have to go out and fight with them.