Hello! We did it last April - my kids were 11 and 9 at the time, so maybe a little older than some of the other children. There were also groups with adults only.
We really enjoyed the tour - feel free to pm me if you want spoilers! It was fun and silly, and we enjoyed our guide. However, having said that, it "felt" about 15 minutes too long, if that makes sense.
The only other thing I will add, since my kids were on the "older" end in the tour, there were a few times when the guide didn't give them a turn for an activity, even though they were participating in the activity, while some of the younger children were given multiple turns. It wasn't a big deal, and my kids behaved appropriately, but I could see they were a little disappointed and I felt they like should have had a turn too even if they were a little older.
ETA: again, that was just our guide, so that was just our experience - yours may be different!