Sturdy and comfy..but...
The Chinese wall fixings supplied are of dashed poor quality, I burred off 3 of the heads screwing in the bolts so I had to drive off and buy new ones from B&Q, otherwise the shelf is thick and sturdy and the little bed is comfy enough for a largish cat, I have 3 cats , 2 kittens and the biggest, a chocolate point Siamese, he leaped onto the lower one and snuggled in and claimed it as his , he is 8 kilos and it withstood his weight easily, I spaced 3 wall beds 15" apart to avoid squabbles and too much rough housing, which they are wont so to do!