Not a big fan. I've been twice with 6 years between and after the second time I remembered I said I wouldn't go again after the 1st time.
It's very expensive. There is a few interactive things on the way round but you are walking behind glass so don't get very close. There are a few freebies but tbh after the cost its the least you can get.
The shop is v expensive even the seconds.
There's a marquee that puts on a show which is ok and there is an outdoor play area.
Having said all that the kids love it, I guess it's just as an adult when you see how much you pay it doesn't seem worth it.
Pre book though as they have slotted times to go in and you may end up waiting ages.