I have had a few of these inthe past, but this last one I bought from Zooplus is very poor quality. Feels like it is made from cardboard and not wood, it almost flattens when the cat sits on it, it is not as curved as previous ones. There seems to be a bad batch of these out there, I ordered some from other shops and they were the same poor quality.
not very stable
I liked this, but my cat didn't agree with my judgement. She put her paws on the 'upward' edge, whereupon the whole thing tipped up and hit her. Needless to say, she wouldn't look at it again.