I just bought Clara a hamster ball, even after reading all the negative reviews from hedgehog owners. She loves it. She's having so much fun in it as I speak. I did have to clean it out once, but now that she understands what it's for, she won't sit still!
I even opened the lid for her, but she wouldn't leave. So far, I think it's a great toy since she could get in trouble without a plastic ball to keep her out of small spaces.