although it supports the weight of our two adult cats, the two higher perches needed the handyman touch of my husband to secure them more substantially.  The little house just below the perches, to my knowledge has never been used by the cats.  I think the opening is too small for their liking.  All-in-all we're satisfied w/it.  

Pros: It's attractive.  The cats love being up high.
Cons: High perches were just a tad bit wobbly.