Dude, my man has a macbook and he is so pissed i got the better one, the screen looks like you are looking into a jailhouse window....
The 400 is worth it, trust me, the only game i use on mine is FM, im not that big of a gamer....
But yo, def upgrade, the Aluminum case is a lot tougher than the plastic one on the reg macbook andyway....trust me, you will not be dis-satisfied.