Even my confident boy hates it!
Read the reviews and bought this anyway as my cat is the cockiest, most confident cat I've ever met. He was super into this toy before I turned it on. On carpet it barely does anything, on hard floors it is SO. LOUD. He could only watch from afar and jump out of the way if it came towards him.
Bonus though is it never got stuck under the sofa like I expected it would, always managed to get out again.
Second bonus - now I've turned it off, cat is all over it. Confidence has resumed.