I have had the guys bring in bad controllers 10-11 times this year. Since all we do is install, they were straight from the box and not working.
From what I heard Pro-c had a bad run on some parts. Most, if not all of our problems were solved by swapping out the face. Hunter took it back and gave us credit.
What I have learned is that every now and then a product has a bad run. That is not enough reason to call it junk and move on.
We had a bad run of rainbird valves a few months ago. About 2 of 10 had molding problems which were causing the valves to leak. We returned all the valves we had in stock, waited a few months, and the problem was solved. The install crews were pissed, because they were having to dig up new valves and replace them once or twice per install.