I called a number of plumbing services today (Sunday Dec 30th, 2012), with my main sewage entirely blocked. I picked Mayday over the others on homestars, for one simple reason:
I called a few places, and asked for their time/materials/truck charges, so I could estimate a relative cost. Nobody gave me their hourly rates. Most wanted to send somebody out for a $50-60 cost, provide an estimate, and waive the estimate fee if I picked them.
Roy was the only person I phoned today (of a half dozen), who picked up the phone, did not sound intimidated, or worried when I asked flat out for a price, and gave me a firm number. That was what sold me, there was no guess work involved, and I associate this with a contractors experience level (frankly, his price was par/lower then most, certainly a consideration).
Mayday arrived at the scheduled time (same day), got to work promptly and successfully, then took the time to show me what some of my future repair plans would entail, helping educate me with regards to what I could handle myself, and what I might not.
Overall, I'm just thrilled that with the gamble of picking a plumber, I lucked out today.
Notably, I gave this a 9/10 review, not because I'm 1/10th dissatisfied, but because I want this review actually read, not white-washed out with the rest of the 10/10 reviews that plaster the site in general.