Hi,
I have owned my Diplomat for almost a year now. I have been very pleased with its performance. The only issue I had was one of the jets on the sport seat kept popping off. That has since stopped happening, must have been some sort of break-in issue. The tub reminds me when it is time to rinse the filters. I have not had problems with water maintenance, I am also a first time owner. My wife and I enjoy the loungers, but my favorite seat is the corner seat with both dirverters dialed-in.
We considered Tiger River Bengal, but we only wet-tested the D1.