I bough this for my two cats (Maine coons), they are both still young 11 months and 9 months. My 11 month old is 17lbs solid, no fat. She is just HUGE, the youngest around 10lbs. They run up and down the cat tree, it is EXTREMELY STURDY. There is no rocking what so ever. They love it. It is an excellent scratch post, they don't go anywhere near my furniture anymore. The hammock is a hit with the youngest, the oldest she loves to sit on the top and look out the window. It keeps them occupied for hours on end. They even sleep in it, the possibilities for your cat are endless with this unit. I am a 55 year old grandmother. It took me 30 minutes to put it together. Very easy to assembly. They fell in love with the unit as I was putting it together. It is truly worth every crying dime.