Great for kids!
We're on a family trip to Las Vegas with 3 kids (1, 3, & 5) and are always on the lookout for places we can go with them. We stopped in at 5:30 on a Sunday and it was busy but not packed. I'd highly recommend the 3rd floor (rooftop) level, they were very accommodating and the kids loved the view. As it got dark, we could see lots of lights and the Bellagio fountains during some parts of that show.
WARNING: The kids meals are enormous. We easily could've fed all 3 kids with one meal.
We paid just under $100 for the whole family (that included a margarita for both adults).