At what point does the SMOT device actually stop working?

The SMOT device described in Wikipedia is said to cause a metal ball to roll uphill and then fall off the ramp.

I understand that perpetual motion is not possible. However, reading through the Wikipedia talk pages and the reference given does not give me a clear indication whether the device works or not. Does the ball go up the ramp? Does it fall over the edge? What part of it “does not work?” Does it go up halfway?

I am confused as to what the laws of physics say can about the device and where exactly the laws of physics say the ball will stop, once it is placed at the beginning of the ramp.