I haven't actually opened this package since it's a gift for my sister's four adopted cats. But I've had two of these exact models for my two kitties for several years and they're very sturdy, take up less room than most other models, and they're used every day by both of them, as well as their predecessors who've since passed on. The tiers are spacious; my two even manage to share the top level when they want to sleep together, so there's plenty of room for a larger cat. I highly recommend this cat tree.