I'm not a teacher, but my best friend is, at a private school. She is expected to get by with much less prep time and longer hours in addition to the lower pay already mentioned working at a private school vs. public. That's about all I know, since I'm not a teacher, but those are things she has mentioned that frustrate her about the job.
OTOH, she says the kids' behavior is excellent, which makes her job easier when it comes to actually teaching! She also gets more backup from parents than she did teaching public school.
Tracey, mama of 5 beloved children here with me on Earth and one precious son I will meet again in Heaven 6/17/09 - 9/6/09.