Lets Start With Config.
Retina display: 15.4-inch(diagonal) LED-backlit display with IPS technology
2880x1800 resolution at 220 pixels per inch with support for millions of colours
2.2GHz quad-core Intel Core i7 processor(Turbo Boost up to 3.4GHz) with 6MB shared L3 cache
16GB of 1600MHz DDR3L onboard memory, 256GB PCIe-based flash storage
802.11ac WiFi wireless networking; IEEE 802.11a/b/g/n compatible
Force Touch trackpad for precise cursor control
First of all it does not include the new ATI Radeon graphics card but for me it doesnt matter any way not much into gaming and stuff.
The only problem I have faced in 4 hours of usage is it gets hot after normal usage thats most probably because of the i7 intel processor and the fact that I was using flash. I’m not that much inside of gaming and all but I do a lot of graphics designing and 3D Renders so it makes problem.