Just read the Ars Technica review of the MBP Touch Bar (http://arstechnica.co.uk/apple/2016/11/macbook-pro-touch-bar-13-15-inch-touch-bar-review/) and it provides Quickbench scores which indicate that there are quite significant read/write speed differences between the 256gb and 512gb SSD versions. Rather oddly the 256gb wins on read speed (2,874mb p/s to 2,677 mb p/s) and the 512gb wins on write speed (2,153mb p/s to 1,449 mb p/s). I wonder how many people knew about this discrepancy. What are your thoughts - do you think the differences will be appreciable in daily use? WWHG.