Roomba and I just love them he has 3 of them the Best Part is my Roomba weights in at 35 pounds and it holds his WEIGHT NO MATTER WHAT WAY I PUT THEM HE CAN LAY SIT ON THEM AND THEY DON'T TIP OVER I REALLY WANT TO KNOW IS WHEN ARE THE OTHER ONES COMING BACK IN STOCK
I have a set of the 5 Katris shapes. I initially didn't love this one. My 10lb cats couldnt sit on the top without tipping it over. Basically I was forced to use this one in concert with another block. Then it occured to me to just leave it tipped over - now it is basically a tiny mountain for the cats to climb. They love it this way.
I mounted this scratcher on my wall as a stepping point for my kitten to get from a desk to a cat bridge. He loves it. He is spending a lot of time jumping on and off of it. The mounting kit (purchased separately) works great and makes for a clean look, since the brackets are hidden behind the scratcher.