Pros: Cats occasionally bat the empty shell around
Cons: Doesn't dispense treats, feather attachment is cheap
The idea of this toy is that you unscrew it, put treats inside, and then screw it back together. The problem is that you can't only screw it partway and when it's tightened completely, the holes are MUCH too small for any treat to fall out of. It's just frustrating for the cats.
Mine has a metal extension with a plastic tip and came with two feather attachments. The feathers are literally stickers. They stayed attached to the toy for less than a minute before the cats pulled them off.