I'm happy to report that my tinkerboard and northpada power supply - are still alive and in one piece (including the cables/connectors, yes I checked) - after being continually under load for almost three days. The board (under a GPIO connected fan) and psu got warm, but not hot to touch at any point, the microusb connection on the board, never once got warm.
@tkaiser is right - even if the manner he goes about it is less than tactful - the board should be powered by GPIO. But in my case, headless usage with only a few devices connected, I don't foresee any issues. So if you plan on powering by the microusb connector (which isn't recommended ) it should be okay with a decent PSU, well in my case it is, but YMMV.