We ate at T-Rex last weekend. We went in for an early dinner at 4:30-5pm on Sunday, and had no trouble getting seated right away for 7 people. My mom and I had gone shopping at DD a few days before (Friday the 12th maybe) and there was a huge line of people out the door at 9pm. So getting their early is a good strategy.
We thought it was pretty neat, the dinos were cool, it was very loud. However, it wasn't so loud we couldn't carry on a conversation except whent he 'meteor shower' came and everything went nuts. My kids got some kind of signature drink in a huge bone cup they got to keep. The ice room was cool, we sat in the fern room (or something like that) which was next to it, it was neat to see it change color but when walking through it on the way out we decided we were glad we didn't eat in there, it would be very hard on the eyes all that blue light. Definitely not an adult or even teen dinner destination until you are really into that sort of thing, but for my 3 & 5 year old it was pretty cool
The food was good, but typical fare, the waiter did screw up something and my kids drink in the bone cup came with half the bone mostly air, but he brought us extra and fix mistakes pretty quick, so I chaulk that up to working out the kinks in a new restaurant. Overall, it was a fun experience.