Pros: 
-Tall
-Lower of the two houses is quite big (may even fit two small cats, my ragdolls definitely don't fit lol)
-Every post is rope, so every inch is a 'scratch point'
-Multi-tiered, seems so obvious but it really does make a HUGE difference, especially for a multi-cat home.

Cons:
-I feel the assembly could tighten together more, its definitely sturdy enough for my two cats but if you have a dog in your family, it could be damaged very easily by one attempted jump onto it, just the same, if it fell over for whatever reason, it might come back up different than it went down, not for certain but it would be questionable. If it cant withstand one mistake, there's room for improvement ya know?

All in all, fantastic buy, I will probably purchase another in the near future and throw it in a different room in my house. Unless you have multiple huge maine coon cats or an excited puppy, there's nothing to worry about.