The down side is that grading becomes more subjective. I have had one or two TAs could not accurately judge students understanding of the subject. It is a good

The down side is that grading becomes more subjective. I have had one or two TAs could not accurately judge students understanding of the subject. It is a good tool though and did determine part of my grade in undergrad CS. This combined with in house programming quizzes/tests should go a long way to evaluating a student knowledge.