It's not as robust as claimed. I've had 4x as many C connectors fail as even Micro USB (and I've had 10x as many micro devices/cables as C).
Which is really disappointing, as C is just nicer in general - not having to try 3 or 4 times is such a better design. I'm still confused as to why A, Mini, Micro didn't have a dot to indicate "this way up" on both cable and device as part of the standard. I added one to everything with either a sharpie or a paint pen.
So yea, robustness - A/B are just more robust in my experience.