This tree is solid - heavy, stable - and was a cinch to put together.  The directions are by picture, and very clear.  My son and I had this assembled in no time!  Our cat loved it even before it was assembled - she was playing with all the parts.  And now that it's up, she LOVES this thing!  She likes the cubby hole, the hanging ball toy keeps her busy and burns off some of that kitten steam (yay!).  All around great item that I would (and have) recommend to friends!

Pros: easy to assemble, solid/sturdy, cat loves it
Cons: none