We were just there this weekend, and DS8 did not like it (I did - DS and DH had to wait for me and I didn't get a chance to see/read everything). I think for the most part, the exhibits required too much reading, or he just wasn't interested. If your children are older than 12, they have a separate spy experience which sounds exciting.

NB - they require tickets for admission within the hour you reserve. You can order your tickets online and specify your time of admission. Have fun!