This is a great, well-made cat tree.  Our cat was checking out the parts as we were putting it together.  He was attracted to and using it before we got it done.  He got so comfortable on it in the next day or so that he fell off it while sleeping on the first 'birds nest' above the box.  Funny, but a little concerning.  He was fine.  

I agree with some of the other posters that I'd like a little more padding to the platforms, and especially the house or box area.  But, overall, good product.