Visited with a 2 and a half years old and had a go...

Visited with a 2 and a half years old and had a good time. Not everything is interesting for young kids (indeed machinery can be intimidating) but one can easily spend a day thanks to the many kids oriented acrivities, which scale well up, I suspect, up to 13 or so. After that it really depends on one's interests.
As a grown up I found the lack of depth on most descriptions appalling: with so much technology on display, the excessive dumbing down of much of the text was at time frustrating.
For any European standards it's exceedingly overpriced, but in line with local prices.