I have this toilet in my aft cabin head. What a wonderful difference it makes flushing with fresh water instead of salt water. The normal head odor is gone! Now the water remaining in the bowl is fresh water just like your home.
I am now replacing the forward head with the same unit. 2 years with no problems and no odor has made me a believer.
If you have a fresh water shortage this may not be the unit for you. I carry 245 gallons on my trawler style boat which lasts the two of us 7 days without any attempt at saving water. Your experience may vary but I'm sold on this unit.