I have two. One is a backup. My flow is fine and I'm sure glad I have one right now. Campground pressure is a little over 100psi.
I do have an Oxigenics shower head which I highly recommend. It sure does more with less pressure than any shower head I have seen.
2006 GMC 2500HD CCSB 4x4 Duramax/Allison, Titan 52 gallon fuel tank, Prodigy Controller, B&W Companion Hitch
2010 Jayco Designer 35RLTS, Cummins/Onan RV QG 5500 EVAP, Progressive Industries EMS-PT50C, TST Systems 507 TPMS, RV Flex Armor Roof