Fantastico!
These are the best toys my 3 cats have ever seen (and they have LOTS of moving toys)!! Both M + F 12-yr olds + young kitten go mad over the purple beetle. It needs a hard floor + if it stops too quickly, just turn the tiny screw a bit and it goes again. It stops after about 10 mins to cool down, but that works fine because they still try to make it move again. Even on its back it whirrs around and has them all baffled and mad with energy. I will get a few more "bugs" so that when they chase it into a corner and it's lost for a bit, I have another one ready.