I've been using Crawford Mechanical for years for our annual backflow test. They always show up when they say, and are in and out with no muss or fuss.
The most recent test, the technician noticed that our backflow is working overtime and recommended that we install a pressure reducing valve. The tech said that our water pressure is higher that it used to be due to city infrastructure improvements.
Normally, I'm skeptical about this sort of thing, but I'd been seeing the problems that the tech said can result from too much pressure.
The technician did have to move the installation back one day due to a part not being in stock. The actual installation was done quickly and professionally.