This cat tree is VERY well made, very sturdy and very attractive. I would have preferred that the top level have an opening so the cats can enter from below, but that was my fault for not researching it further. As it turns out, our older inside cat prefers it just like it is - he sleeps on the top tier most of the day. Our younger, active indoor/outdoor cat has yet to attempt the climb, but she does sit below it studying it for long periods of time, and we're confident she will attempt the ascent soon. She's an excellent climber. So all is good and everybody's happy. Thank you.