Word of warning: The current 2015 models sold by Apple don't have the discrete GPU, only an integrated Intel Iris chipset. Graphics performance is atrocious, es

Word of warning: The current 2015 models sold by Apple don't have the discrete GPU, only an integrated Intel Iris chipset. Graphics performance is atrocious, especially with scaled Retina. I often experience sluggishness related to graphics performance. To get the discontinued, superior discrete model, you have to find a refurb or a used one on Craigslist/EBay/etc., and you have to be pretty lucky to find one with all the right specs (for me, minimum 1TB SSD and 16GB RAM).