My almost 4 year old cat Noelle pretty much destroyed the rope on the scratching posts on the cat tree I bought about 3 years ago. I repaired it a couple of times since buying it. And as you can see in the attached pic, it is in need of repair again.
I just bought this new cat tree in the second pic. For now I plan to keep both and repair the old one again; keep one in the entrance hall where the old one is standing now, and the other in the breakfast room where the cats love to look out the windows. Both of my cats seem to be aggressive scratches and both like the scratching rope posts. Noelle's claws are huge and she really goes at it, that's why it doesn't last longer than about 6 months.