Been looking around and realised there's quite a big difference between the 256GB SSD and 512GB read/write speeds? From my quick check: 256GB 2300read/1300write 512GB 5000read/2000write Can users confirm this? http://www.notebookcheck.net/Apple-MacBook-Pro-15-Late-2016-2-6-GHz-i7-Notebook-Review.185254.0.html This good review above shows some good details, and is whereI got that 512GB read/write speed from. Can base 256GB users and those who upgraded post their speeds here? Edit: I do suspect the 512GB read speed is a little excessive and abnormal there actually. Seems generally this is at about 2900.