I had no problem assembling it --- I had instructions and pictures that made it pretty easy. First I sorted the parts to make sure I had them and to make sure I could see the difference in each part. Moved slowly and had no problems. I think with a large, heavy and/or more than one active cat/cats this will vary BUT it would be better to put them against the wall as directed in the instructions. I leaned it against the wall and felt the difference with my hand that made it more stable. With 3 small, very active kittens, I only occasionally observed a very slight wobbling. I don't have it on the wall and it's on carpet ---- I felt better (sturdier) on our bare floor than on carpet. As for the hanging ball/toy that came with this ball - it has a metal clip that should hold the elastic cord that the puffball hangs from - one of the kitties got caught on his toenail. the metal clip immediately and i unclipped my kitty's fingernail and the metal clip had already come loose and for me --- this metal clip is just dangerous --- i just pulled the metal clip and it came off and i just then tied a rubber band on and done and the kittens had no more problems with this toy and were very happy! On our rug, not on the wall, this works very well for 3 kittens, they jump on it, play on it, scratch it, sleep on it and love it! I think it is very well made and I am very happy with this purchase! And I think it was very good value for money!
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