Scratching received quickly. Quick and easy installation. The ball is currently resisted. This is more than for the previous cat tree that had lost in the day. Warning: the small top shelf is hair cell (surface) for a cat of 3.5 / 4kg. So just to be a big cat. But hey, she 30x30cm which is the standard size for tablet "small" trees. Same for the "niche" space, the size is right for my 3,5kg cat, so do should doubtless for a big cat - or used to store toys ... The structure has very stable air with 4 feet. The color is pretty. A view on the short and medium term for the resistance.