Product exterior needs additional padding from carpet to scratch areas.  Cats claws contact wood frame and doesn't lend itself well to cats scratching.  Size of platforms could be a little larger to accomodate large cats. I have to large cats who cannot move through areas well because of the limited size. They have fallen off twice.

I have an older tree that has the thicker padding and all seven of my cats prefer to sleep on the thicker carpet rather than this tree. Try thicker softer cover.