[WinnieTheHam]

I dislike them. It constricts their movement, it disrupts their natural movement, it restricts where they want to go, it's a small confined space, It can make loud sounds when crashing into things and hamsters have very sensitive hearing, they aren't free to do what they want, they can't eat or drink inside the ball and they can't properly interact with you through the ball. It's also difficult to determine whether they enjoy it or not because a stressed hamster inside a ball can easily look like an excited one (I personally believe all hamsters dislike them).