That was one example of a real review from a real window cleaner. Not a trialist but someone who bought it. OK some people may not save time, but surely saving water allows you to do more work with the water you have, without having on some occasions to drive about to get more water, so more work can be done. I have came across people who work on a reduced flow so as not so much water is wasted while they keep the water running, but these people are wasting time on the glass.
Everyone works differently, flow rates, turning water on off etc. No doubt other reviews and opinions will be along soon. The ultimate set up I would say is a good flow of water (less time on each window) with the ability to easily turn it off moving from window to window, so no water wasted.
You shouldn't get a burst of water when you turn the tap on if your settings are right. When you dead end the water the pump shouldn't run building up pressure in the pipes before the controller or pump switches the pump off.
They should be available in many more places by the end of next week. Doug, Lee, Richard, and the Window Cleaning Warehouse have them just now.