I don't have one. Many of my fellow Gemini owners have installed them and I've seen (and not smelled
) them. I want one, and will install one once I get to it on my list of upgrades. I just wish someone made a marine head with a house sized seat.
The simple fact is two less holes/through hulls in my boat is to be applauded. Properly installed these can not smell, clog or break, and especially can not sink your boat. Who can say that about a holding tank?