My cats use this everyday.  They don't always use things I buy for them.  They are Himalayans and quite picky.  Although one is scared to jump up to the top bed, my other cat sleeps in there everyday.  It also catches a lot of hair as the fabric they use catches it.  They also use the bars as scratch posts.  This piece looks great in the house as well.  Easy to assemble.

Pros: Looks great and cats use it!!!!
Cons: on the large size, if size matters