The exhibit was nice and I think it was worth the $15 I spent. I enjoyed all of the photos and the video that accompanied some of them. I was expecting there to be more explanations on the stories behind the photographs and was told there were going to be "near frames" for the photographs. However, only a few of the photos had the near frames and there were only a few compelling or interesting back stories about the photo's subject - the rest were just the photographer talking about how many days it took him to take the photo or what he was there on assignment for originally. I also found a few typos on the boards, which made me feel like it wasn't a completely professional installation - you would think National Geographic would ensure the grammar and spelling of a traveling exhibit would be correct. However, the photos were really great to look at.
The gift shop was seriously lackluster. Another big complaint I have is the staff. When I was waiting on my friends and perusing the small gift shop, one of the staff commented to another that he hopes nobody else comes in after 5:30pm so they could get off work early. Not appropriate to say when a customer (who is just about to come in before 5:30pm) is standing right there. Another staff member was talking on her phone when she took our tickets and even walked briefly into the exhibit after us and looked like she was video taping the exhibit for whoever she was on the phone with. They also left the door to the gift shop open so the loud rock/pop music that was playing in there really ruined the mood of the exhibit.
So, improvements I would suggest would be to have more interesting gift shop items and to not hire immature teenagers to work the exhibit. Oh, and fix those typos!