Got my new MBP 15" and love it. Its easily the best computer I've ever owned (and thats saying something coming from a 2012 MBP retina which was no slouch). I'm a video editor and deal with moving large amounts of data every day. Today I benchmarked my external Lacie SSD (also from 2012) and It gets 378/305 read write over thunderbolt 1. Over the new Belkin USB-C cable I bought (not bothering with dongles, I bought new cables) I get 427/327. That's a nearly 50MB/s increase in read speed. (see attached benchmark pic). I thought that was kinda cool!