We've had one in my parents house for the past 30 years and as far as I remember, no one ever used it. Usually it’s used to store dirty laundry before washing. Maybe I should give it a try…
Do they have the type that's it's own separate bowl requiring you to waddle over to it from the toilet? These always seemed so weird to me versus the type mounted right in the toilet.
It’s separate, next to the toilet. When I was a child, I always thought that this is a special kind of toilet, but I couldn’t figure out for what kind of use (I never used it, though). It was my parents’ summer house and they probably built it in, because it was a trend or requirement at that time.