From the beautiful quality!

I bought it several months ago: my two cats have not even wait until I ride to adopt and they are regularly installed every two (one on top - the dominant - the other in the hiding, very spacious).
Installation is fast (takes 30 minutes) and equipment is provided: like the other reviews, attacking from above, it will itself. All fasteners are metallic but ultimately, none are accessible to the end.

The assembly is strong (I have a cat of 7.5 kg which does not spare it) although the top floor "pitching" a little.
The only negative is the top plate has a wooden base and edges wicker (+ metal frames), but suddenly when the cat wants to go down, he takes the claws into the edge: mine took several weeks to "take the hit" and anyway cats are never very good at downhill.

In summary, a very good buy quality / price ratio.