Great cat tree for large or small cat.  Can be put together as shown or as I did.  I rearranged the different size piece and was able to make it two shelves high with the basket seat.  My female cat is a large tuxedo cat and a bit heavy and it was her choice not to want to go too high, although stable when I put it together as shown it was very stable, more so than some on display in stores.  I purchased this one so not to interfere with heat coming out of a wall/floor heat vent.  It does have a strong smell but it does dissipate, although the smell did not bother my cat..