I had a major leak to the main line from the meter. They promised to show up during a window from 8am-12pm. They never showed up. It turns out they had failed to inform me of their policy that they will not honor the appointment unless they establish phone contact first. Given what somone else here said about their service rates, I am now really glad they did not show up.
Please be warned. You are far better off ignoring giant companies with giant Yellow Pages ads like Superior, and simply coming to a site like this, or asking your neighbors to tell you about a good, dependable local plumber. That is what we did, and we got a swift, quality, reasonably priced repair.