I'm going to wait a considerable time before I consider the use of these. For one they pass through a restriction which can clog and lead to a callback on my end.
Also, when high pressure is evident in the home these devices will shut off. The customer may get really upset with the plumber if he/she is "lining the pockets" so to speak by installing supply lines that do not work in a normal fashion like all the others have before these new ones.
Let us know of the outcome of yours; the guys at home cheapo say they wish they didn't sell them because people are returning them.
Some people no matter what you explain to them will not address high pressure in their homes. They like those hard jetting showers even though they make shower heads that can do this with less water.