I was having issues with my shower on the second floor. I called Z PLUMBERZ of Ann Arbor. The first man they sent out looked at the problem, and his suggestion was the standardized approach. However, having done a lot of home improvement work myself, I was not satisfied with that answer. So, I called the company, and they promptly sent out a second plumber to provide a second opinion. He was able to diagnose the real problem, and he fixed it! They did a pretty good job for me!