Two things.
Product design should be intuitive , with all the markering hype , where exactly has apple made it clear the cable that comes with the computer is usb2 speeds , don't blame the customers here, for not finding some fine print in my opinion . Hint here is something as simple as blue connectors as used for usb3 is good product design .
I honestly had to go out of my way to find and confirm the charge cable was only usb2 speed .
TB 1 and 2 backward support on the new MacBooks is apples issue and it's not working well from everything I have read, I will try my sonnet on Tuesday when I get the dongle , if the new MacBook Pro cannot see my Sonnet express , it's a deal breaker, every other mac wirh TB I own, be it TB1 or TB2 works fine.