Automated Litter Boxes

Has anyone tried that new automatic litter box that flushes itself? Looked like a great idea but also looked like something that would scare my "Scaredy cats" to death. Funny how the biggest, most macho looking cat is always the most easily frightened. Of my 4 cats, the biggest is afraid of everything out of his normal routine and the smallest cat isn't afraid of anything. I keep trying to tell him that sometimes a little fear is a good thing. Especially when the cockatoo is chasing you across the floor trying to bite your tail.