Great product. It's a little pricey (hence 4 stars rather than 5 on "Value"), but then you get what you pay for. I've used a training collar before (tried it on myself first--didn't hurt, but it did snap my head over to my shoulder!), but it died. New dog, new home, no fence, old collar died. We need both containment and training, and when you add the two together, this really isn't all that bad price-wise, I guess. And this type of training aid really is quite effective. Since I only just purchased this item, and I therefore have no track record of personal use to go on, I cannot give it a 5 star rating on durability--time will tell. However, Innotek is a leadin manufacturer of this type of product, and I have no real concerns as to the durability issue. Overall, a great thing. Much cheaper than a physical fence, and unless you have a husky or some other semi-wolf or totally aggressive large dog who will charge the fence intentionally because they do not care about the consequences, this product really, really works.