Got this for my cats birthdays. They're senior cats so having a tree that I could build a few different ways to keep them safe but still give them enrichment was important to me. One of my cats is 15 lbs and she has no problem climbing up to the top level(I have it in the 2nd configuration) and loves to look out the window. My cats weren't sure about the taller levels at first, but after a few days and some encouragement from me they're both happy to lounge on the taller spots as well as the lower comfy spots. My big cat especially loves to lounge in the crescent shaped bed spot--she claimed it as hers as soon as I brought the tree into the room :D Still not sure about the clear dome bed, but we've only had it set up for about a week, so there's time! The pieces are quality made oak, and look and feel very sturdy and classy compared to cheap carpet covered models. I really love that the soft beds are machine washable and fully removable from the tree, it's perfect for allergies and makes this tree super easy to clean! Make sure to use a gentle cleaner designed for wood tho--I used some strong disinfecting wipes and ended up having to lightly sand the pieces smooth again bc the chemicals seeped into the pieces and made the surface feel rough. The whole thing was built in less than half an hour and other than the crescent shaped bed was super quick and easy! No extra tools needed and I have nerve damage in my hands so not a huge amount of force needed either. Very happy with my purchase!