We were going to take DD1 to this a few months back, but we read on the advert that it was for older kids (think maybe 5yrs? and up). Im not entirely sure if that was the age recommendation, but I remember us dismissig it because of the age thing and we thought DD1 would be scared by it.
Im a bit peeved we missed it though, might give it a go next time when it comes along though and see how she goes. We can always leave if it gets to be too much for her I suppose