"Ok So I bought this one and I also Bought Expansion 3. My hammie hates expansion 3. The little potty house it comes with, he's scared of it. The wheel on the outside of the cage... he loves it, but its way way way too loud. The purple curly tube he doesn't right like to much. He Loves this look out tower though. He climbs in there and just hangs out there. I put some aspen bedding in there, but he kicked it all down the shoot and just hangs in there with nothing. it also makes it really easy to take him out of it to play with him as you scoop under him so he won't bite you. This is one of the best expansions I've seen and my hamster loves it. I do admit it isn't much, but for it not being so much it sure makes one happy hamster and that is all you can really ask for."