My gf who is a student was told by turbotax she owed over $300, after doing it on paper, the old fashioned way, the tax liability was 0. Why? The tuition deduction didn't apply on the EZ version of the form.
Ultimately turbo tax takes a conservative, strict and rigid approach to taxes, but as anyone knows this isn't the reality of doing taxes. For anyone with a moderately complex return, I think it's better to hire a tax professional, then at least you'll LEARN something for your money (which can be about the same amount!).