What is evidence? Scratching tree, with its 3 caves and different levels a lot of space for fun and games, but also for the quiet hours, he is perfect. Our three cats have accepted him immediately and use it quite often. Since they are outdoor cats of course, he is not used consistently :-P
Negative, I regret to evaluate the blueprint and the actual assembly because the assembly instructions only consisted of an A4 sheet with very little explanation and the scratching post despite genauestem hold absolutely to the instructions do not fit the bill. We then eliminated shortly herand part and voila :-) now he stands straight.