My Carriage trailer came from the factory with the Wastemaster system ten years ago. I was excited about it until the first time I used it. Two complaints. The first time I dumped my tank, the hose stretched out to thirty feet like a slinky gone wild, even though I was only six feet from the sewer. It didn't hold it's shape like a Rhino or some others. Also, the valve didn't screw into the sewer connection, so I had to stand over it to make sure it didn't jump out when I dumped. Have those two issues been changed?
As far as cost, if this system lasts for ten years, then the $140 initial cost is less than I've spent on Rhino systems during that time period. I usually get 1 to 1 1/2 years from the Rhino.