And here we go.
There are two camps here, those that spent big bucks on a Watts after having owned common types (the $9 variety) and those that spend $12 on the newer "High flow type that work and flow perfectly good for RV use.
The "High Flow" was Camco's response to those that complained of low flow with their cheap regulators. Maybe Camco felt they were loosing sales to Watts but for what ever reason, they came out with the improved type which is regulated to 50 PSI instead of 40 and flows fine.
Bottom line is the Camco High Flow works perfectly - I've had one for 5 or more years and I have to lower the pressure in the shower because it sprays so hard.
The Watts will also work fine - just at a much higher price.