Dave, I have the sani con system in my Dutch Star and have had it for 5 years with no problems. While the 3" hose will dump faster, there is less mess with the sani con.
When it is time to dump up hill or down flip the switch when the tank is empty flip the switch again put the cap on, place the hose in the compartment off you go. I will say this while I have a black tank flush if we are in a hurry or I just choose not to use it I will let the gray tank collect the night before and use it to flush the hose.
