The Surface Pro 4 is soooo crap! What a lousy experience! Hello face recognition randomly failed (one attempt, didn't try again, immediately prompted to use PIN) so I logged in with my PIN. Then went to improve face recognition which worked once. Tried it again and got a blank window. Go to log out and back in again and the Start menu doesn't work - the start button doesn't bring up anything. Restart the machine, log in, and audio out of the headphone socket doesn't work where it worked two minutes earlier. Unplug headphones and audio through the speakers doesn't work! Audio settings shows audio going to the headphone device but nothing sounds.
Only MS can make an OS that breaks doing absolutely nothing. On their own hardware!