I don't plan on doing anything major on it. I mainly use Xojo to create apps, do 2D graphics, and very seldom do 3D graphics. However, when I do, they're not very complex, say a million poly count. My "complex" models will be around 1/10th of that. Will Cycles (Blender FYI) work with the Iris graphics? I have an external monitor which I'll use as my primary display so screen real estate isn't an issue. Will the 13" rMBP be good for what I do? Update: I am deciding to go with the iMac 21.5". Dedicated graphics + Quad Core too good to pass up.