We have eaten at the T-Rex in KC too. And trust me it's not as bad as Rainforest Cafe. I actually think it's much cooler. My DS loved it.
There are several themed rooms. Bar area is sea themed with a giant octopus hanging overhead and a huge aquarium. The rest of the rooms downstairs have other dinosaurs, of course there's a giant t-rex at the entrance. There's also a room upstairs that's the ice age and has a mammoth. At the very top are planets, meteors, etc and every 20 minutes or so there is a little lights show but it's no where as loud or annoying as RC.
I can't remember what I ate (it was back in October) but for some reason I remember DGM (my mom) got nacho's that were huge.
It didn't seem as overpriced as RC either, so that's a good thing.
It's owned by the same people who run Build a Bear Workshop. They have a cute "Build Your Own Dino" area. The gift shop isn't too bad priced either. If you're kids love dinosaurs like mine you can find some cute and educational toys that won't cost you their college education