As I haven't used one I don't know how effective the design is at keeping a cham there. I do know that once a cham decides it wants to go somewhere they are very determined. Also, chams do occasionally let themselves drop onto the floor from the end of a branch and stroll off. When I free ranged I set up a barrier wall around a section of the floor where my potted trees were that was taller than a cham could reach, and smooth (cardboard or thin plywood works) so they couldn't get a grip on it. The diameter of the area needs to be larger than the widest branches of the tree. Most of the free ranges I did were in a second bedroom and I just blocked the door with a piece of cardboard.

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