Compost systems have been around for decades and i think they are great.
But they havent gone mainstream
And well we just have to face facts that it doesnt satisfy peoples expectations in sanitation, wrong or right it matters not, just cold reality
So here we are trying to make it more acceptable for everyone.

So this system (touch wood) should smell no worse and possibly better than a regular septic system

Theres an S bend airlock at the user end so no nasty smelling breezes come back up the pipe. In fact the user experience is no different to a regular flush toilet. Unless we tell tjem, and we will, theyd have no idea