i use them ...i use it so misty doesnt choke when she sees 1 squirrel..or DEER! I think they are wonderful to just have..misty likes it better so she doesnt choke to death..lol..its much easier to control them too when the go buzurk(sp?) for a dog,cat,animal,jogger,kids,biker(yeah mistys a lil err)

Overall i give it a 5 star rating!