Used Dentzer plumbing multiple times at the recommendation of my property management company, and thought I was getting decent work. Turns out I wasn't.
I always felt they were expensive, but I didn't realize just how absurd their pricing was. They were also not only misleading/deceptive on price for a later (very simple) job of just replacing a couple of hoses, but also did absolutely nothing to clean up the area where they worked. They're unwilling to bend on the absurd price, and also claim to have not received my check (which I suppose I'll believe because it doesn't appear to be cashed) - so now I have to cancel a check and send another... Yeah, checks... like grandma writes... because they don't have a way to pay online.
Even worse, I confirmed that some of the work they'd done was of poor quality. In particular, they mounted / clipped some copper pipes up with a different metal - a huge plumbing no-no which I didn't know at the time, but which a plumber alerted me to.
Not being one to believe any contractor who badmouths the previous one (because they ALL do it), I did some research and confirmed that in fact this was a dangerous and poor practice because it would cause eventual corrosion. Google Galvanic Corrosion and see for yourself.
A plumber who can't follow basic best practices is not deserving of my business.