Love this idea. Came with easy-to-understand instructions and plenty of hardware. 

Unfortunately, I don’t have confidence that the sisal posts will be able to handle my 18lb cat leaping to and from them when he goes to put his weight on the post, there’s a little bit of give and it worries me.
The posts themselves are hollow with thick plastic disks on each end, and these disks screw into the fuzzy end pieces. The trouble is, since the post is hollow, all of the weight depends on that disk holding strong to the screw in the wall- and unfortunately, i’ve had cat trees with this same screw-disk system, and my cat has broken every one. The plastic disk just snaps and there’s nothing for the screw to hold on to.

I’m still going to be using the shelves, but unfortunately i had to take the posts off the wall. Maybe one day I’ll have lighter cats and I can bring the posts out from storage )