Yes I have tried it and works great (my puppy won't come home until January) but it came with 4 kongs!
you can set on a 4 hour or 8 hour timer and will dispense a kong at intervals for your dog, you can just set it up on the edge of a countertop then one will drop out for it
Pretty cool for us since he will have to be home alone 3 days a week or would just be nice when we have to leave to run errands or whatever