My friend had a hamster that went crazy over this stuff. Right away when she cleaned the cage and added the bed fluff the hamster would start to make his nest. He seemed so happy and content sleeping in his own fluffy nest.

Pros: Great for nest building fun

Cons: None

My rats love it! they shove it in every corner and sleep bundled in it, but it does stink if you don't change it out every few day, which makes the rats mad because they have to rearaange. =]

Pros: texture, comfy

Cons: holds pee in so it stinks quickly