My 14 year old daughter and I visited on a Friday. It was busy, but not "overwhelming" crowded. We did have to wait quite a while for the Tram Tour, but we still were able to visit most of what we wanted in the time we had (we were on a Houston City tour and had to catch a shuttle bus back to downtown). The new display with 747 with Enterprise mounted on top was really fantastic!! Wish the Mission Control stop on the tour had a bit more substance. Overall this 40-something was happy. I do lament how today's elementary and high school students don't have a space program to follow as closely as my generation lived the Space Shuttle Era and those before me had Apollo, Gemini, Saturn, Mercury, etc. I'm glad we made time for this as part of our long weekend in Houston.