Once we got to the observation level our visit was amazing. Once you exit the lift (elevayor) it is a very open airy space with incredible views. Going outside to the oberservation deck the views are even more impressive. You can access the upstairs via the outside steps or inside stairs. There are limited eating options and more limited seating. The problem with out visit was the queueing time. None of it was explained. After we bought our tickets we joined one queue. First the snaking queue in the shopping centre, then more internal queues through quite a claustrophobic corridor. We were never told how long it would take. Then a wait for the lift to take us to the observation deck. In total we queued for 90 minutes, despite having tickets for a particular time. When we came back downstairs (another, mercifully much shorter queue for the lift) the queue in the shopping centre was even longer. Overall it was worth it, but I would have liked to have known how long it would take in advance.