I'm looking at a few of these reviews, and, since I don't think Mike actually gets on Yelp, feel like I should address them. Those who say Mike doesn't have cotillion-level manners are right--he's a bit of a gruff guy, but if you're nice, he's nice. If you treat him as a lowly service-person, he's gonna be maybe a little less sweet to you. Can you blame him?
Mike is a one-man shop, and he operates with very low overhead. He handles emergencies, which is why he's answering the phone at 9PM--because your sewer could be overflowing into your bathtub. You want something installed sometime this week? Well, that's not really his focus (yes, it would be nice if he had a website that detailed his focus, but see previous comment--low overhead).
I've worked with Mike a few times since I bought my house in 2006--it's 1945 construction with the original clay sewer pipe, and we have root problems. He's been prompt, efficient, and has always been very honest about the work. He put a cover on the city cleanout when he discovered the city had failed to do so, and wasn't even planning to charge me for it. He told me I *could* replace the sewer pipe, but it generally looked ok and it would be cheaper just to have him come out and snake it every few years, and I could probably get at least another decade out of it. (Roto Rooter told me I needed to spend $10K on replacing the pipe, and that I needed to do it yesterday.)
What's more, how cool is it to have a plumber with a PhD from Stanford? Not only does that tell me the guy has boss critical thinking skills, it means that he chose this path because he really does love plumbing. In particular, sewer-related plumbing (in other words, if it's going out of your drains and toilets, he works on it--if it's coming in from your sinks and showerheads, he's not too interested). You want to really make him happy? Show some interest in his work--he loves explaining to homeowners what he's doing, because it makes them smarter consumers of his services.
I heartily recommend He-Man plumbing for all those times when the sewer pipe backs up, the sink won't drain, or the toilet exploded all over the bathroom (though if that happens, you may have bigger problems than just plumbing). You want to install a new showerhead? Probably not the thing for Mike.