Anyone here attended a private prep school, or know people who have? How did it affect your/their life?

I'm talking about prestigious, expensive, ones, like St. Mikes, UCC, Crescent, BSS, Havergal, etc. Not smaller religious ones, or diploma mills like Blyth.

Do you think it contributed to financial and career success? If so, how and to what extent?

Did it affect personality and character? If so, for better or for worse?