I had a very good experience with Cupertino Plumbing. I contracted with them through Costco when I needed to have my water tank, which sprang a leak, replaced. The workers who did the work were very friendly and knowledgeable. It was a difficult task, because they had to take out my 75 gallon water tank. I thought they were very professional and did what they could under the circumstances. They did really well even though it took a while because it was a difficult installation.