Wonderful Experience. Brought my grandson. The Exhibit itself was excellent, a visual delight. Must see for kids or anyone who is into visual art / participation. The line queuing was a bit odd. They had you stop and see a teaser, but kept piling folks in, so it got a bit crowded as folks were filing in, after 2-3 iterations of the intro had completed, we still couldn't exit. You queue up again a couple more times, for face photos, and eye glasses for sun protection, and then the trip to the top. Once you get to the exhibit, you can spent as much or as little time as you want. Spectacular views of the city from all directions, several visual experiences on each of the observation decks, refreshments and drinks on the top deck with 'outdoor' seating. Prices for the intermittent photo stops were reasonable. 60-90 minutes would be an average. Don't be late. If you are late by more than 30 minutes, you could get re-scheduled... Worth it. Do It...