We both enjoyed this visit and especially the mission control trolley tour. It was quite emotive to sit in the refurbished mission control room and listen to recordings of the first moon landing, we were 16 when this event took place originally. The displays in the mail plaza were interesting with a lot for kids to do but the independence plaza with a time line and models of the space lab, lunar landing etc were most interesting to us.
The only downside was the lack of a paper map of the exhibits though I understand the move away from paper, we had not downloaded the app and nearly missed a major part. So, I recommend you download or print off the floor plan before you go! Or maybe the facility could have big screens around the place with floor plans.