As others have said, it all depends on the private school. In our case, we found a near perfect private to put our DD into after K in public school.
Some of the potential benefits of a wonderful private school: personalized instruction, small class size, teachers who care, teachers who actually know your kid, a willingness to grade skip, teachers and administrators who treat you as if you are paying their salaries (oh wait, you are), etc.
Private school tuition can be a bit of a bear, but if your child doesn't develop a love of learning early, that money you're putting away for college might not be needed.
I don't know where you are located, but if you are in Eastern IA, USA - then I have a couple of great suggestions for private schools.
-S.F.
