Very happy with these guys. The owner, Leo, was quick in getting back to me this fateful morning, when we found the basement flooded with raw sewage--on a Sunday, of course. Communication was excellent: he told me he'd have somebody to my house in 2-3 hours. When some other emergency called his technician away, Leo called back immediately to let me know but told me I'd be the next priority, and I was.
They're not the cheapest, but I decided to go with them because I was worried about the age of my sewer pipe (my house is over 100 years old), and Z Plumberz is one of the few companies that have the latest technology to deal with old, damaged pipes.
When looking for help, I had read a horror story told in a review on another local plumber who damaged a sewer pipe while snaking it. Their insurance company refused to pay. The bad plumber apparently hadn't used a camera to assess the condition of the pipe to ascertain whether it was already damaged. So sue me, he told the person, who had to spend $10K on repairs.
I shared my concerns about that with Leo at Z Plumberz, and he told me that they wouldn't snake without first using the camera to make sure the pipes were in good enough condition. What if they aren't? I asked him. He told me that his company has a way out of that problem: they use what's called trenchless sewer line repair, which is utterly awesome: it's a repair method that allows plumbers to repair your pipes underground, negating the need to dig out an entire trench. Absolutely do google that term - trenchless sewer pipe repair - if you have sewer pipe issues in an old house. Do be careful, though: one drain expert told us that a crooked plumber out of Saugus has been offering this type of service (it's pretty newfangled, and only about 3 plumbers in the area offer it, we were told) but was charging people the cost of photographing their pipes, claiming to show them images of clear pipes, but in actuality those were old photos of somebody else's pipes and hadn't done the work at all. He was convicted, we were told, but he's used 3 different business names, all based out of Saugus (sorry, legitimate Saugus plumbing/sewer pros!), so it wouldn't be surprising if he popped up again doing the same thing.
At any rate, my situation wasn't that dire. The problem wasn't with the pipe outside the house. Rather, My tenants or somebody else had flushed wipes - that horribly common cause of drain blockage. They got stuck in the drain trap, and the drain backed up. It was straightforward to fix, took an hour, and the cost was $290.
The technician who came - I think his name was Auden, perhaps - was equally professional as Leo, communicated really well, and was very informative. He did a lovely job cleaning up with his shop vac, though of course we had to get down there with a whole lot of bleach afterward, so that was our Sunday.
I'd highly recommend Z Plumberz. I would have also been happy with John's Sewer, I think. They sent somebody in a really timely manner to suss out the situation, and he was great. The only reason I chose Z Plumberz was because of their ability to do trenchless repair if needed: a technology that even the John's Sewer tech said was cutting edge and top-notch.