gormanBoth. Default is 6KRO. I see some odd behavior with NKRO on the Mac; e.g., it forgets that I've remapped Caps Lock to Ctrl. 6KRO is plenty for me, so I leave it at the default.
This is one of the few mechanical tenkeyless keyboards with backlit keys and a USB hub. The hub lets me plug in a mouse and headset transceiver close to me for a stronger signal.
I have brown switches with red backlight. Blue switches would be nice, but I reckon they're a bit louder. The red backlight is perfect at the lowest setting, and I turn off the side panels.
My only complaint is that the labels on the front of the keys for the Fn functions are not lit.