Susan and I bought one after Alumalina in 2013 when our factory shower head died. From our perspective it makes the shower spray better than the factory head. With respect to water usage, it seems to be about the same or less. We haven't measured the flow so we can't testify with authority. We spent 57 nights in the trailer during our trip west this year, including up to four boondocking nights in a row. We were very glad we made the switch from a comfort perspective.
When we installed the new head we used the factory Airstream hose, instead of the one that came with the Oxygenics, allowing us to use the existing wall mount. The matching push button water cutoff came with the Oxygenics.