Hi all I've got the mbp 2.66Ghz, the early 09 model my screen is the 9C85 I was using the 84 before, something went wrong apple change my mbp to another unit which is what I'm currently using now the 85. I'm not sure for others, but I notice that the 85 is more yellowish warm compare to the 84 so I've created a profile towards more neutral with 2.2 gamma too. Before with 84 I used the default profile with 2.2 gamma alittle bit warm and I like it that way. Right now I'm very used to the custom profile I've created, but I'm afraid my eyes are getting used to it. what I'm trying to achieve here is to get the same balance color for neutral just afraid when I see on my screen with iphoto or aperture it's fine, but on print out or other screen it might look different.