i just replaced the shower head in the van after complaints from the young ladies in the family that the shower was hopeless at washing their hair. Research pointed to the Oxygenics Body Spa brushed nickel shower head. This shower head is made specifically for RVs. Plenty of YouTube reviews positive. So bought one on flea bay from US as couldnt find one in Oz.
Had a test shower with old shower, then fitted new shower head. Definitely more pressure from new head. Testing 1 Minutes flow into a container, the Oxy used slightly less than the old one. However the pressure increase should translate to faster hair washes for the ladies, so less water used....in theory.
it definitely feels like a better shower, so I think it is worth the change.