When I saw the power cord connector in the keynote, I thought it was cool. After having one, I don’t like it. It comes unplugged all the time. My Mac regularly warns me that I am on reserve battery power. I look down and the cord has come unplugged.
On a related note, having all the connectors on the sides is inconvenient too. When I sit with my MacBook, I regularly sit with my legs crossed. The connectors on the side hit my legs. This of course knocks the power connector out. I am afraid I am going to damage the USB port.
Maybe I will get used to it.