My friend has a cat wheel and 3 cats (or is it 4?). It is large, 3.5ft ish tall? They keep it in one of the bedrooms which said friend sometimes sleeps in. She says the youngest kitty likes to use it in the middle of the night. The older, tubby kitties who need exercise never touch it. It can be decently loud. I’ve said no way no how RE getting one for our own cats. We have no place and I know they (the thinner cat I’m sure, not the chunk) would use it at the most inopportune times. We are the crazy cat people who have wall mounted kitty play things - shelves, bowls, and scratchers. IMO they look nicer than one large a$$ tower and give kitty more space to play.