I only know of one person who uses Dosatrons instead of tanks and Hydrominders. He seems to have a lot of problems with them, a lot more than I do with Hydrominders and
FloJets. His biggest problem is that when the water is shut off to the unit and turned back on, it leaks. He originally had a solenoid on the water feed to the unit so there was no pressure on it when no bays were in use, but after a month he had to take the solenoids out. He also had problems with water pressure which meant on a busy day the tire cleaner or presoak would be overwhelmed by the air pressure.
I've spent less time and money on
FloJet pumps and Hydrominder parts and problems in the last eight years than he's spent on the Dosatrons in the last four.
Hydro has a line of pumps like the Dosatron - I don't know if they're any more reliable.