UHHHH I read the reviews before testing mine out and I did find a bunch of dead keys. Based on reviews, I thought "bad board!". BUT... NOT SO. User error. The sockets seem pretty tight and pretty easily bent my switch pins. When I finally figured out how to get the switches out, sure enough, the dead keys had bent pins.
Obvs many people here are having actual PCB or socket issues, but if you're like me and this is your first time putting a switch into a socket... be gentle. I can't help thinking I'm the one one this happened to :-(