I had the pleasure
of using the one at Hole in the Wall this summer. The one there is open air style and not enclosed like the one at Sperry appears to be. Users approach from the rear, so if someone is already there when you go to do your business, you can only see them, if at all, from shoulder up (depending on height) due to the massive tank behind the seat. It’s easy to use— I’d rather pump with my foot than flush with my hand. And there was no odor.
The view from the seat is almost as good as the one at Boulder Pass.