We did a thorough review of cat trees before settling on one and Kitty Mansions seemed to be the best for a quality product at a reasonable price.  We are very pleased with this purchase!  It arrived on time, and was very simple to put together.  Our kitties took to it immediately- they are about 6 months old- and none of them has trouble getting to the 3rd tier.  Two are very skilled jumpers and one just climbs up the post to get to the top tiers- it's great exercise for them all.  It's very sturdy and handles even the most intense kitty chases up and down the tower.  We couldn't be more happy with this purchase.  Unfortunately, neither the dangling mouse or ball lasted very long with all of their antics...will have to replace them with something else.  The unit also looks very nice with the decor in the living room- much nicer color options than most cat trees.