We were thinking about getting a Roomba at one point recently but decided against it because we figured the pugs would kill it. However, if they weren't around, I could EASILY see one of the cats riding it around the house.
It takes me about 30 seconds with a wire grill brush to clean my grill, and I save $130. After watching the video, it takes longer to clean the Grillbot that it takes me to clean my grill. As long as the grill is heated sterile and all the chunks are knocked off, that's as clean as my grates are ever going to be.