Our kids love it. Ages 3 and 6.
The 3 year old is all about eating odds and ends from the salad bar. One of us takes him up with us to look as soon as we are seated and then fills a plate with all the completely random stuff he wants to try. Plus lots of cheese and fruit. That keeps him happy and busy until the "meat guys" start coming around. Sometimes he'll try a few of those things, but usually it's just salad bar.
The 6 year old feasts on the various meats. There's really no other word for it. She loves it!
As for the ambiance or atmosphere . . . you anti-kid types have got to be kidding. Brazilian steakhouses like this are fun, loud places with built-in entertainment. Kids blend right in to the scene. It's not like these are quiet, romantic restaurants!!
And by the way, lunch is a far better idea than dinner. As is always the case when it comes to kids and restaurants.
Enjoy!!
