Update: the company contacted me to address the pricing issue outlined below and they have now resolved it to my satisfaction. I have increased the rating based on them making it right. I suggest you understand their pricing structure before they come out. Thanks for making it right, Express Rooter. As I said below, their quality and professionalism is excellent, my only issue was with pricing.
Original review follows:
I decided to go with this company based on what I've seen on Holmes on Homes. Big mistake. I needed a couple shut-off valves replaced urgently. The plumber called on the way over to let me know the diagnostic would cost $150 but it would be waived if we used them for the service. The plumber quoted me $700 to replace both. Having done similar work before I know that the parts required cost $15 maximum. It took the plumber about half an hour to do it. I only proceeded with them because I needed the work done urgently and I had already lost the $150 for the diagnostic. Although the work was well done, the pricing was insanely high. Do not use this company.