about 8 months into my experience with my 15" MBP 2016 I had the underbar-hyphen key stop working altogether. They replaced the key for me in the apple store without charging me. Glad I have apple care, I'm sure other keys will follow. Currently my right shift key is starting to get sticky feeling which was the precursor to the "-" key failing on me. I'm not impressed with the build quality considering the high cost of this machine $4000.