My experience
i suppose this is a pretty old thread, but i guess i might as well say what happened to me anyway: so i have the late-2008 aluminum macbook 13" 2.0GHz and this game runs like crap unless i put mostly everything on low. btw i have 2 gb ram and a 9400m. at first i was disappointed because i was really looking foward to getting spore after all those years of hype, and it looks like a game from 2002 with low settings. i can choose to turn up 1 or 2 things to high but after that it gets really slow. so usually i just use high graphics effects and high lighting. i was looking foward to the "5x better graphics performance" of the "revolutionary" 9400m but it did not show at first. later i got COD4 and it plays nicely on medium settings, and it looks a hell of a lot better than spore. pretty good for an integrated GPU, dont ya think? looks like ill have to put spore on bootcamp... it disappionting though because i'll usually just be bored and click spore to play for a while, i dont want to have to boot windows every time... i guess it's worth it if the gfx improve but i already beat the game so there is less motivation for me to reinstall it.......