We have one and he uses it as a container to put stuff/toys in. Doesn't really sit on it or anything.
My LO seems to be sitting on his drum or shape sorter when he's pooping.. thinking about getting one soon just to expose him to it.
We have one and sit her on it after a nap and that works sometimes. But not starting training yet. Just getting her used to going on it. Did the same with our first and worked well when we got round to potty training
We have one in our main bathroom. He sits on it before his bath. We’re not potty training or anywhere near yet it’s just to expose him to it. We did it with our first and it worked really well in terms of it not being scary or a big deal etc