A PhD certifies that you are able to do research independently, at least in theory. Unless you are aiming for one of the very few CS research positions in indu

A PhD certifies that you are able to do research independently, at least in theory. Unless you are aiming for one of the very few CS research positions in industry or for one of the jobs developing a product that require very specific cutting edge knowledge that your research happens to have been in, a PhD is likely to be of very little use.