Freezer composting toilet

Hello! I am looking into getting a composting toilet for a self catering unit I’m building. I have seen online a Separett toilet that freezes its contents, supposedly making it smell free without the need of a fan. The system seems attractive because it appears very uncomplicated both for my guests using it and me emptying it. Has anyone out there experienced one of these toilets? I would very much like to hear some user feedback!