So I've had this board for a few days, and I have to say that it works impeccably with my iMac running macOS Sierra Beta. It really sucks to see that others have been having issues, as my experience with the board so far has been really great. I'm using it for work, and it's very responsive. Got it with the Cherry MX Blacks, and there hasn't been issues with LEDs nor any switch issues. The only issue that I have had is that the 4 additional media keys above the numpad are not working at all, but I believe that's because I'm on a Mac and the keyboard layout is unrecognized. Otherwise, I have no complaints. I really hope everyone else gets their issues resolved.