my cats are still using it, although there is some extracirricular activity. (unfortunately, that's not completely unheard of here. i have a couple that fight and that generates occassional litterbox issues.)
for right now, i've turned off the auto cycles and just close the door and start manually for now. and i'm seeing less stalking of the box as they were doing for a while, so i think they're adjusting.
Me? I adjusted in about 30 seconds.