I was apprehensive about ordering something off line for my two rather large cats but this is perfect.  I was very pleased with the quality of the materials and the way it went together.  It is so sturdy and untippable.  When you have two 15 pounders jumping off of it it is a huge concern.  Both of my boys love this is every way.  They use the sisal rope and love to "attack" the mouse.  What they love most is taking turns sleeping on it of course!