Bought this Jan 23 2018, Center support needs to be rethought to make it more secure. Top tier has to be turned every few days to retighten. I would suggest a nut set into the hole of each tier to over come this problem. August 17, 2018 top tier very loose! will no longer tighten. August 18, 2018 woke up to find top tier has broken off and the piece holding it to the central spine broken off. My cat loved this tree but will not buy again and will not recommend to any of my cat friends!