I have a wireless one for four years now. Works great. The only difference is you don't have as much control over your perimeter, but it worked out fine for our space. As mentioned, the key is training the dog. The shock is just a reinforcement. That being said, My dogs were trained in a very short time. Well, the old cow dog went into fetal position and had to be carried into the yard for a few days, but now we're good. There was an incident with chickens and the shock collar, but that has to be told over beer.