How does Batman: Arkham Asylum for PC compare to the PS3 and 360 versions?

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Do they differ at all? Are they the exact same game, but just for another system? I just want to know so that I know whether or not the sequel (Arkham City) for PC will be worth buying for PC or to just play the 360 version at a buddies house (since I dont have a 360 or PS3) which I'd rather not do.How does Batman: Arkham Asylum for PC compare to the PS3 and 360 versions?
They are all the same. The only difference is the controls obviously.

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