DS (11) passed the Mensa test so we're giving membership a try for one year to see what it's all about. Can't say I've been overwhelmed by the experience so far - it all seems a bit dated, dusty, quirky and disorganised, and there's not much in the special interest groups that can't be found outside of Mensa. Pre-internet I can see it might have had a role in bringing people of like mind together, but these days there are other ways of buddying up with people who share your special interest in e.g. chess, steam engines, baking or the life and works of Shakespeare.
But am I missing something? If you or your DCs have been members, what have you got out of it?