We've eaten several times at Ninja, a couple using a Groupon. I prefer not to use Groupon though as they have a large selection of "all you can eat" sushi for $20 (which you can't use the groupon towards). It's not the worlds best sushi but it is good and a great deal for the price. We have not tried the teppan side but it's always packed. The service has been slightly slow but decent. I'd say it's somewhat kid friendly because, while there are no coloring books they do have kid entrees. We will definitely be back.