Just in case your still checking this post, I have the Sani-con in my Monaco. It's not any faster than an old style hose and not any slower. It takes a few minutes more to empty full tanks, but I don't have to deal with cleaning a hose and putting it away.
Just a tip. My two tanks are side by side. I dump the black and then pull the valve on the grey. The two tanks try to qualize and the black tank fills with grey water. I turn on the Sani-con and empty the black again. I do this twice and never have to hook up to water to rinse or flood the tank. When I'm at home, I'll fill both tanks occasionally and flush them out.
The Sani-con isn't the perfect answer, but it sure beats messing with the hose and flushing it.
Don & Mary
2014 Newmar Dutch Star - All Electric - 450 ISL
2016 GMC Canyon 4WD Crew Cab