Great product and my cats love it. This would be 5* product if the dry wall connections were better. 

All the wall mounts really need to be screwed into the studs, which is not possible. Some of the brackets have to screw into the plaster board. Do not rely on the wall anchors supplied with the unit to hold a cats weight, the anchors pulled out from the wall even when one side was drilled into studs.

My main cat is ~12-13lb and where I could not drill into a stud, he essentially ripped the wall mount out the wall. This also cracked the wooden step attached the the bracket.

I replaced the dry wall anchors received with the unit with molly bolts (Molly bolt set including tool was ~24) and this has completely fixed the issue.

As I said, if the unit came with moly bolts or proper dry wall anchors then I think it would be a 5* product.