We did it with our 6 and 8 year old's last summer and loved it.

The basket tipping over on landing comment above is valid but I would think the exception rather than the rule. When we landed, 4-5 members of the staff on the ground grabbed ropes hanging from each side of the basket to keep it steady and it was a very gentle landing.

I would however think about the sound of burners and very young children as they can be quite loud and sudden if you are not expecting them. Nothing too bad though and our children were fine with it.