I woke up to a backed up sewage line. I called five companies and EZ Flow was the first to respond. They told me 10AM and JD arrived at 9:45AM. The clog was fixed in less than 30 minutes. Since they were already out, I had them replace the cartridges behind the shower handles. I have an older house with 'questionable plumbing' and obsolete components. JD did an excellent job of explaining the issues to me in advance so that I wasn't surprised by the pricing. Based on previous experiences with plumbers, I think that their pricing is very fair and reasonable.
On a different note, they also email you a notice with the name and picture of their plumber who is going to come out. While I personally don't care, this makes me feel much safer if my wife needed to handle this while I was out of town.