This is a great tower for the money, and you can't go wrong with the free, quick shipping.  Assembly was very easy, except that Hannibal and Nikita kept trying to play on the tower while I was assembling it.  Expect this with your kitties.  Mine really love their tower, especially the upper tiers.  The only reasons I didn't give this 5 stars is that it can be a little wobbly toward the top (though it hasn't actually tipped) and i have to tighten up the bolts a bit.  Otherwise, I am pretty satisfied with this product.