i have a kitten with tons of energy! He instantly climbed all the way to the top and loves the little white thing dangling! hes always on it and playing! Its not a eye sore to me its very "elegant" with the vines! 5 stars all the way! 
ps. this thing almost touches my apartment ceiling! if your looking for a sky scraper this is it!

Pros: STURDY AND MY KITTEN LOVES IT
Cons: NONE