I am a "foster failure" for a local pound, meaning I have multiple cats.  I bought 2 of these since the cats were fighting over places to sleep, and they love being up off of the floor.  The minute I put one together, one guy jumped on top and one girl climbed in the cube.  Both slept there. There were 2 that have been fighting, so I'd say it helps.  

Unfortunately, the post man put my box in a place where one of these got completely soaked in a downpour.  I dried it out with fans and a heater and it is holding up.  I know a lot of cat furniture has cardboard inside that disintigrates when it gets wet, but the water did not seem to damage this.  

Pros: Great value; very easy to assemble; holds up when wet
Cons: I would have liked it in a color to match my living room, but the brown is OK.