First time buying one of these for the cats, I read all the reviews on many and decided on this one. So happy I did! ! ! Both cats love it they each picked their spot and spend a lot of their day either playing on it or sleeping on it. 
I put it together myself - took me about 30 minutes. Which is pretty good for me. I expected it to not be real sturdy but I made sure everything was tightened and I have to say... I am shocked how  sturdy it is. Im so thrilled I chose this  one.