Pros and cons of private school?

We sent our daughter to a Catholic school. One of the biggest benefits was simply that everyone at the school came from families where the parents valued education enough to pay money for it. So the tone, the culture, was a positive one. This is not to deny that there are plenty of families of public school kids where education is also valued, but at her school, there wasn't the apathy or hostility toward learning, or towards kids who studied hard and took teachers seriously, that good students often have to contend with at some public schools.