The site checked out the Robot Restaurant, which is less a restaurant and more a cabaret. For ¥3,000 (US$38), you get to see the robot show and a bento meal. According to Yattar News, after you enter the joint, you wait in a lounge with a giant female mecha—which you can get your photo taken in! Continuing:
After waiting for about half an hour, we were led down into the second floor basement in preparation for the show. We found our meals waiting for us on trays attached to individual stools—there were no traditional tables in the show area.
That's apparently so patrons will focus on the performance. The two-hour show consisted of ladies singing and dancing. And when they weren't doing that, they were playing the drums.
The robot portion, during which women in bikinis began piloting mecha in, um, bikinis, was apparently only twenty minutes of the show. The site did say that the robots moved smoothly, though (for only twenty minutes, I guess). Still, most of the show is singing, dancing, and drumming—that's it.
However, Yattar News didn't say how the food was. Looking at images online, the food didn't appear delicious—but seemed like something you could buy at convenience store for cheap. So there you go, the Robot Restaurant—neither a restaurant and not much on robots.