I previously had a Macbook Air (mid 2013 Haswell), and I was pretty impressed with the way it handled some light OSX gaming (games like Bioshock Infinite were able to run on low settings pretty well). I figured it wasn't bad for a integrated GPU. Anyways, I picked up a base Retina MBP 15 inch. I had some reticence spending that much on laptop with a iGPU... After installing windows I must say it's a very impressive iGPU! It handles games like Fallout 3, Old Republic, Bioshock Infinite, Planetside 2 etc at higher resolutions, with a good amount of effects enabled (with anti-aliasing being the obvious limiting factor). I play a descent amount of Old Republic, and while it was able to run at native rez, I chose to run it 1680 x 1050, where I could bump up most the effects to max ad keep 50-60+ FPS (sometimes 70+). Point is, if you are planning to use your Macbook Pro for video editing, sound engineering, production, academic scientific use, CADD, or day to day tasks, etc, and are worried that the integrated GPU wont be able to hang for some moderate gaming (and don't have an additional $600 to get the discrete GPU), fear not!!!! Intel did a great job with the Iris Pro!!! I don't know if it's the small cache of RAM, or the extra execution units, but it is surprisingly potent! I'm also impressed how they packed it all on the same die as the i7, without having serious heat issues under load. If you are considering the 15 inch rMBP, do it!