The cats have used it and are loving it since the day it arrived, our adopted cat athena was abused badly and she NEVER plays with anything, shes afraid of her own shadow. 20 minutes after i put this together she was clawing and bedded down in the enclosed tower condo and the first out of 3 to rip a mouse off which we reinforced with thick cisel rope and heavy duty staples. We are VERY impressed. Thankyou so much for such a stimulating and amusing product.