This was my first time to use CUPERTINO PLUMBING. This was a major plumbing job, over $30,000 in fact. Their workers all showed up on time, and were very friendly and polite. More importantly than that, they were competent. Very competent plumbers. That was what was most important to me, and what impressed me the most about them - how competent they were. That is why I gave CUPERTINO PLUMBING Five Stars across the board!