I've never been to any of mine, I just couldn't imagine being there and having to answer the myriad of questions about 'life since School' and the awkwardness of all being together after so long. The few friends I have run into since School have only been interested in 'one upmanship' about how their lives have so far panned out and I am not interested in engaging in that sort of thing and would imagine a reunion would be rife for it! That said, I do have a couple of friends from High School that I keep in touch with and are life long friends.
My sister goes to all hers and loves them, but no, not for me.
Gah, I sound like a cranky old cow now.