For me the frustration is moving from a machine that never once got in my way or stepped on my toes (the 2015) to one that does constantly. The typos, touch-bar brushes, speaker pops and stuck keys, were they on a machine that I had no prior experience with, probably wouldn't be so frustrating. But, coming from years of reliable use with the previous generation of machines, they stand out immensely and cause major annoyance just because they seem so unnecessary. I was conditioned to expect much more from MacBooks