After calling Fox and another independent plumber, I found they wanted a $59 trip charge, $119 an hour and could not get to me for 1-2 days. On the advice of my insurance agent, I called ARS and they not only did not charge a trip fee, but met me at my house within 2 hours. The technician, John Medina, did an excellent job - he took the time to listen to my issues and correctly resolve the issue, despite it being close to the end of the work day. Their fees were reasonable, in my opinion; I even purchased additional services which they offered.
For those of you who need a quality and reputable plumbing company, I have first-hand experience that ARS (2306 Howard Lane, Austin 78728; 512-345-4050) is the professional to call. Good luck.