There's a few issues with the design of this toy.
Firstly the rope. It's fairly thick but not very tightly wound rope which means using very thick perches and leaves very little room for the birds to get inbetween the spaces. The fraying at the bottom also makes it irresistible for small birds to attempt to peck at and make into nesting material. Over time the constant pecking could cause the knots to loosen even more and cause the whole bottom tier to fall apart as the rope material itself is very soft and pulls apart easily.
Next the perch sizes. Being so thick they aren't suitable for small birds. Small birds need thinner perches that are approximately 1.5cm in diameter. These perches are roughly 2.5cm in diameter which is suitable for large birds like parrots and cockatiels, but the space between the different tiers is far too small for them to perch on. The thickness of these makes it more difficult for smaller bird claws to grip onto and stay steady on and over time can cause severe claw issues.
A parakeet or other animal that enjoys climbing ladders may prefer this, but with the rope being so loosely twisted and of a soft material it won't be long before very sharp beaks will shred it to pieces and cause it to fall apart.