As other reviewers have stated, do not pay full price! You can get the tickets from a third party or as one of the "Pick 3" deals with Mandalay Bay, Luxor and Excal.
The exhibit itself has a lot of interesting artifacts and information on the Titanic, it also has some parts that seem rushed or just added to increase the admissions price. The large piece of the hull is very impressive. I did not really grasp or fully appreciate the grandeur of the Titanic before seeing this exhibit. Everything from the fixtures to the dinning china. Things sure have changed.
Its all walking, and there were only a few benches, so come with your feet well rested. I do not think this exhibit is suitable for children, it is mostly reading. I wouldn't have liked it as a child...