Visited from Ireland with a 15 year old Potter fan. The tickets are a little expensive but are worth it ultimately. The studios are well laid out and can cater for huge crowds. The sets from the movie(s) are amazing! Even if you have no direct interest in Harry Potter you will find the sets, the props and the special effects / models / CGI hugely interesting. The outdoor scenes (Privet Drive, Night Bus, etc) are memorable but the highlight of the tour is without a doubt the MASSIVE model of Hogwarths - whatever you do don't miss it.
The only downsides were the prices in the gift shop which were a bit over the top and the Butterbeer - try it but don't expect to like it!More