Good for rodents, but probably better for birds
So far, my degus love them. I'm a little concerned about the way they go down when my degus jump on them, but it seems to stay securely fastened even when they use it like a springboard. Also, degus are heavier than the birds this is marketed to, so I won't knock a star off for that. If you own smaller rodents like mice or gerbils, I would highly recommend these. Just be careful with heavier rodents like rats and make sure there's a hammock to catch them underneath if it's high up in the cage.