DanMac plumbing was selected by the restorer who rebuilt my basement after a flood 4 years ago. DanMac did a great job then, and more importantly we have yet to experience any issues with their work. They replaced all of the previous owner DIY plumbing for the shower, vanity and bathroom, as well as installed the shower pan, toilet and vanity. At the same time I also used DanMac to install a new radiator, and again was very satisfied.
My only reason for lowering the recommendation rating, is that I asked for a quote for my upstairs bathroom (for tub removal/replace and radiator removal/reinstall), and the quote came in twice as much as the other quotes I received. I was surprised at this, as they were quite reasonable with the additional work I added to the basement restoration.