I have no other cat tree to base a comparison for this review which is why I gave it a four. There might be something better but this is good.

My 10-week-old kitten didn't start using it immediately but he also had shots that day so he was feeling sluggish. He was using it within 24hrs though, so pretty good acceptance timeframe?

The construction seems durable from an engineering standpoint but as another reviewer pointed out, it is a little wobbly. This only worried me because I thought my kitten may not want to play with it, but he doesn't seem to mind after all.

Assembly time was about 20min. Very quick compared to most household furniture nowadays (desks, bookshelves, home entertainment centers, etc). Could be even faster with a power drill, which I purposely left out for the sake of this review. Instructions were very clear (not that its very complex to begin with).