I bought the KA2, a Logitech ERGO K860, and the ZSA Moonlander. I returned the KA2, use the K860 daily, and am keeping the moonlander for a VR side project.
KA2 was a pain. I don't understand how people can use a keyboard that's got a 3" lip. Maybe it is supposed to be used from a keyboard tray, but definitely not on top of a lap or a desk.
I adjust my desk and chair so the level is just right for good posture. The 1.5" of keyboard height is necessary for the curved key wells, which make this keyboard more comfortable than any other I've tried.
KA2 was a pain. I don't understand how people can use a keyboard that's got a 3" lip. Maybe it is supposed to be used from a keyboard tray, but definitely not on top of a lap or a desk.