I also attended private school. I was in parochial school from Kindergarden through 12th grade.
I can go on about being in private school as well, but the pros and cons have been explained very well by the previous posters
I just wanted to add, that I am thankful and grateful for the sacrafices my mother and grandmother made to put me through private school. I'd say in total, my mother paid $30,000 for me to go to private school all all those years. She could've bought a new car (me one too!), put a down payment on a new house..we could've been livin' large...but she invested in ME...my education and my faith in GOD. And for that, I'll always be thankful!
Yes, it's expensive, time consuming (remember Market Day, Bingo, Casino Night??

), but I feel it is worth it, and prepared me for college..much more that many neighborhood kids who went to the Chicago Southside public schools, where I lived around.
I don't mean to "down" public schools, but I never missed school becuase of strikes, we were safe in our buildings (limited access), we all wore the same clothes, my classes were small...all the "small" things. And of course there's the DISCIPLINE!
I can go on, and on (esp. because I went to an all girls private high school--very different from coed), but I will add, if you plan to put your kids in private school, KEEP them in private school..
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"I am not yet the author of my life; I am still it's unenlightened protagonist"
---Unknown