So..I have been waiting long for the new MBP and I thought we might get the Iris 580 but we got the Iris 550. I just want to get an idea, how much graphics power does this give for gaming? Are we talking PS3 level or Wii U? what should I expect? Is eGPU something I can do? It would probably be cheaper than buying the $2300 '15 MBP with AMD GPU.