Hi,
I just saw your thread and wanted to tell you that the Automatic Flush that City Kitty makes is the same as the Technical Concepts, and Rubbermaid one. They work beautifully for humans, but not for cats.
The tech support at Technical Concepts told me that City Kitty had to change their advertising to just say that it will autoflush one time per day for a cat.
The sensor doesn't pick up on my cat, Rocky, and I tried putting it ALL OVER the bathroom!!

I had that thing hanging from everywhere with no luck.
Also, you wouldn't want to just put the autoflush there unless you could supervise, because it may scare your cat. It makes a slight noise and could startle your cat and create problems.
Hope you made out okay with your holiday!!