Our 18 pound male Siamese loves his new Catio !!! he spends a lot of time out there watching birds and lizards and snoozing... pretty easy to put together, pretty sturdy, yes we did put a stronger lock on it and hubby built a little tunnel from the cat/dog door in our slider (new for the cat) to the Catio and and removed the back-right-bottom screen so he can come and go when he wants.