When I had cats (wife took them when she left), I had a motorized litterbox that sat on top of a cabinet. When it scooped, instead of going into the small container, it went into a continuous plastic bag. Could go about 2-3 weeks w/2 cats without emptying. It was great. Bought the setup on eBay.
I do miss the cats.
The problem I had was the poop kept getting all over everything with my scooper.
The Omega Paws have no mechanics. They are sort of built as a giant circle. You roll them over, and when they come back, all the poop is in a pull out drawer. You never bend and scoop. It just seemed to work cleaner.
But if you got the mechanized ones to work well, more power to you.