Great fun
When I first tried this I felt it was a bit cruel and wondered if my cats would get frustrated due to never catching the light. However, they have completely sussed it out and I am sure that they know how it works and that it doesn't exist but they play along with me anyway! My youngest male cat goes mad for it, throwing himself around dashing after it, excellent exercise for him. One of the two old girls loves it too, I haven't seen her play with anything much for years but this gets her going. The other old girl just doesn't get it, she can't see why the others are so excited about it. Maybe she's just too intelligent. All in all it is a good toy, especially for indoor cats and the batteries seem to be lasting ages as well. Just use it in small doses and alternate with real tangible toys.