I have not read all the responses. But we had one at our old house. DH used a tool to bury the fence wire himself. When we got hit with a tornado, we could not find the break in the wire, but it did not matter, we had no power for about 4 days. But our dog never went out of the known fenced area.
We moved to a rental house, that was not fenced in. So we invested in a wireless electric fence. Havahart or havaheart, is where I got it. It was the kind you can have any shape. DH just walked where he wanted the fence, with the controller. Then went back and did flags. The only problem is with this fence, the battery on the collar does not last and needs to be changed daily. We live in a very rural wooded area, so I think it is also a signal issue. However, the dog does not breach the fence, at least not yet. With the buried wire, the battery was charged 2x in 2 yrs, so it lasted a long time.
Havahart, also replaced our collar for nothing, because ours stopped working. It was only 4 months old.
I love the customer service. The cost was about $800, included the collar (the one I had to return), but we got another one. It is portable. We moved from the rental to our new permanent home and it was easy to redo it.
We have a Great Dane by the way.