I made the mistake of buying a laser pointer at the same time, so kitty totally ignored everything else for a few weeks. Now, however, she has discovered this toy. In fact, her playing with it right now prompted me to write this review, as she bats the ball around in a hopeless attempt to free it and kill it.
She likes to go on it at night, so my advice would be to either leave it downstairs or pack it away at night time if (like me) you live in a flat.
When it is in a circle, she has also discovered that it makes a much more suitable bed than any of the comfy things we have bought her, and can often be found curled up in it when she isn't trying to sit on laptops.