The one thing that is known about such devices is that they do not save you money. The thing that is not known is how they go about attempting to prove that you do, so that they don’t have to pay anything under their guarantee.
Back to basics: The cost of your electricity will depend on the amount of energy your equipment draws each month, as measured by the meter at your home or business. If you have an air conditioning system motor that runs for, let us say, a half hour, it will draw the same amount of energy with or without their device connected. Where are the savings? OK, so for the small fraction of a second during the motor’s start cycle, there might be a surge in voltage. I don’t know how that can be (starting cycles tend to drop voltage, due to the large inrush current), but let us assume it happens. With their device connected, the voltage won’t rise above 130 volts. Without their device, it might go higher, and for that brief moment, there might be a little extra heat generated. But where is the difference in the amount of energy drawn by the motor? A fraction of a second makes no measurable difference in what the meter sees. So again I ask, where are the savings?
Now back to my original point. How do they prove you saved money? Do they simply let you submit a year’s worth of electric bills for the year before, and the year after, you install their device, and then send you a check if the bills did not drop by at least 10%? Why do I doubt that? If you boss has any real interest, or if he is getting any real pressure from the sales person, then I suggest that your boss should press very hard for a written description of the process to be used to prove, or disprove, energy savings.