Not me personally, but two of my friends with the Space Gray MBP suffer from chipped and/or discoloured palm rests. Probably a reaction from body sweat and oil in constant contact with the area causing the chemically anodised coating to gradually uncover. I've had mine for about a year and there was no discolouration present. I didn't do anything super special and I didn't consciously try to keep my wrists away from the palm rest. At most I just clean my MBP at least once a week using a slightly damp cloth. My Space Gray MBP top case has since been replaced to address its keyboard problems.