The advantage of RO is cleaner better tasting water. The disadvantage is 3-4 gallons of waste water for every gallon of clean water. When boondocking the pump also has to run more.
Returning the unfiltered RO waste drinking water to the tank adds to the tanks contaminates which increases as the tank empties. So increased filter replacement. Most of the tank water however is used for other purposes like washing hands etc and doesn't go through the drinking water RO system.
So pros and cons to cleaner water. But maybe there are no cons - I have a RO system at home because I don't like the water taste... But there is the initial cost and filter replacement and my tank (bladder) failed once and the second tank is starting to fail.
Just my 2 cents...
