I have purchased and installed two of these systems now on two separate properties. Obviously satisfied enough to buy it a second time. Best truth I've seen posted after reading many reviews, good and bad, across multiple brands and having the experience of using this system myself is this:Any electronic fence is a "TRAINING AID" not a set it and forget it containment solution! We happen to have a smart, relatively submissive dog and we spent ALOT of time in supportive training mode. There are some dogs/owners no matter their intellect or disposition that this may not totally work for. From a technical standpoint my only comments are these: Strongly consider the expensive high grade wire. It is a totally different almost bombproof grade of wire. For the labor effort of burying the wire combined with the pain in the neck factor of locating a wire breach once it is buried makes the high grade wire a must unsell your system is small or the install is basically temporary as in my rental house situation. Main technical comment is that all collar units I have had just plain failed and quit working each in less than a years time. Fortunately they were both within the warranty period and they did promptly send warranty replacements, but that leaves you collarless for a week or so and having a smart dog, he went on a lot of "field trips" that week. Incidentally when I called in, I googled the customer service number and spoke to an actual person. Final comment is that they have successfully designed a unique battery which I could NOT replace with anything I could find anywhere, you are pretty much slaved into buying multipacks of their expensive batteries that do not last as long as I would hope :/ Despite those comments, overall the thing works well and we depend on it.