Update:

So we put this in in the fall, and it's now the start of May and honestly, i'm really pleased still. We had set up a small area at first, but come spring we realized that the whole yard - we have a side lot as well - needed to be expanded. It was ridiculously easy to expand it. Honestly. And the same to teach her the new boundaries. I still give this a five star, no regrets. We didn't sink the line I opted to instead by a bunch of sod staples and just force it down. Spring, grass grew up and over it. I have no problem mowing over it so long as I was generous with the staples. The flags didn't last the winter but honestly, we didn't need them to, she knows what the yellow line means. The beep is still more the deterrent and the shock the re-enforcement. She does occasionally barrel right through if there's a squirrel that's just REALLY REALLY too tempting, and then she sits on the other side of the fence, begging to be let back in since that squirrel was worth getting shocked to get to, but not so much to come back in. I still have a lot of line leftover, it's a significant chunk they include and it literally was plug in and fiddle with the strength of the line versus the strength of the zap from the collar. So, 8 months later, still a very satisfied customer. If you don't mind the DIY and need something more flexible, far less expensive than a fence fence and doesn't require a permit or thousands of of dollars, this is a great way to go

Old:
Before this, our solution to letting the dog outdoors - never off a leash because she's a runner - was an aerial line that ran between a post and a tree. She was forever getting it tangled up and in the winter, we'd have to hold the clip for a minute or two to warm it up enough to be able to attach it to her collar and let her out. We have a corner lot property, a fence is just not financially feasible and honestly, we like the look of our unfenced yard.

So after looking up the various fences - and what was in our budget - I settled on this fence. At worst, I was out a hundred bucks and learned my lesson, at best, I had just spent 100 bucks and made my life easier and the dog had more freedom or at least the illusion of. No. Regrets. It came fast, and set up was surprisingly easy. The instruction manual was clear enough to me, and armed with only my pocket knife and 100 sod staples - I opted to not bury it underground for now - I set out to install it. Half hour later I was done. I still have half a roll of wire left and I think we'll probably cut the line and expand it - comes with a set of stuff needed to splice the wire.

It took a few days of both the dog learning the boundaries - I do wish there were more flags - and us learning the appropriate level with which to set the fence at. But within the two days, Tali had pretty much nailed down where the boundaries were. Two escapes but that was at the start.

The collar is a cheap collar, and we took off the shock unit, put two holes in her current collar and attached it. Make sure it's not too tight, or it can rub against the skin and irritate it. We made that mistake and have to go get her a new collar but that's part and parcel of learning.

As of writing this though, it's fun to leave the door open and let her go out at will. There's a red giant squirrel who baits her and she hasn't crossed the line to get to it - and boy does she love to chase that squirrel - but she has come right UP to the boundary. Strangers stood in my driveway, and she did the same, where normally she would have come right over and licked/barked them to death.

I'm glad I took the chance, we'll see how it goes after a few months and through winter. If I have to replace the wire further down the road, that's fine. The unit itself though, is just great. No regrets, I'd buy again in a heartbeat and wonder why I didn't do it sooner.

We have install around 2000 feet of wire around our property and they controller is installed inside a weather proof box. So far everything works prett well. We made the mistake of installing the wire and no walking our dogs around the property so they could understand the boundary. Our stubborn labs found out they could run through the boundary and only receive a mild shock. Once we found the problem and increase the correction level and put up flags and it seems to fix the problem. Our old wirless system only allowed the dogs roam in a 90' circle around the house which didn't give them any freedom and there was a lot of dog poop to clean up around the house. This new system allows them alot more room to roam and do they thing out in the desert.

The media could not be loaded. I have a smart dog who can open doors and take off and I'm not a good dog trainer, in fact I can't even teach him the most basic things (luckily he is a good boy). Lately he had been escaping too often and getting me in trouble with the neighbors. Got couple quotes for a fence work around the yard but would cost over $10k and require permits. I decided to give this a shot, I was able to install it by myself over 2-3 hours on a Sunday with slow phase. Then trained the doggo as instructed for 2 days (they recommend 2 weeks of training). Now it is Wednesday and I can confirm that he is not leaving the yard :) even if I come close to the wired area he stays away! this saved me so much money and trouble! I can't be certain on the battery life yet since it's day 3 but I would be willing to change the battery occasionally considering it solved a huge problem for me!

Great product easy set up

I got a puppy to replace a dog who died of old age and for company for our other dog. This created a fence problem. The new dog we got is a rescue doxie, and a digger. We have coyotes, so we had to do something other than tie him up each day. Our 2nd dog was forever going down into the hill and canyon area we live on. She was always covered in stickers and would go out and bark incessantly where we could not reach her whenever it was dark, night and day. But she never tried to dig out from the parameter fence.
I was a nervous wreck trying this method. I installed it myself and it was not easy. The twisted wire thing is totally confusing. I could find zero good videos or direction on how to make that work. My handyman neighbor even came over to help me and he could not figure out. And he is fixing genius. So I ended up just running the wire under the eves on the side of the house I needed this fence to not shock. I am just running a basic square around my backyard property. Once I had it set up. I spent a week following the training and the dogs did not get it at all. They thought it was playtime, they grabbed and ran with the flags and it was stupid and frustrating. I finally decided to just turn the fence on. I had bought an extra collar, and one dog got shocked and the other one was not getting anything. I thought the numbers on the main controller were the shock settings , but I finally read the shock collar directions and found out that is the distance it will activate. Each collar has a button the goes from 1 blink to 5 blinks and that is the shock settings. Don't be lame like me. Read the directions first. Once I got that right it all started working.
When I bought this system, I was scared. I did not want to hurt the dogs and I was upset while deciding to use this system but there is no way to build a fence like this one on the kind of property we have. Once I got it all figured out correctly it has been working exactly like I hoped. My older dog, a cocker, who runs away when she smells something, and is very bad with that, got shocked about 4 times in two days and is not doing it now. She is running right up to the shock line and stopping. Much to my utter amazement and the cats! Who are learning to sit right outside the line, which has been quite amusing.
The new dog only needed two shocks. The first day he ran back in the house and did not want to go outside but the next morning he was back to himself and he has run through the parameter once and cried to get back in.
It has only been 8 days since I turned on the fence, but I am truly amazed and happy with it. My animals have a large safe play space, and my older barking dog is not covered with stickers from running down the hill into the canyon area, and learning to control herself with the barking and craziness we have had for years with her. (Yes we took her to classes and training. When she smells all the wildlife in our backyard she goes nuts). That was a side benefit I did not even think of when I bought this. I am hoping after a few months I can turn the collars way down. I have them both set on 4. We tried the lowest setting and worked our way up and they both ran through the boundaries at 3 or lower. I also shocked myself on the 4 setting on accident, and I can tell you, it is the same strength as when you plug in a bad plug or outlet and get shocked.
The thing to keep in mind, is the dogs do not get shocked all the time once they figure it out. Which only takes a few shocks.
So it sounds worse than it really is to use a "shock or electric wired system". One final thing, this one I bought is half the price you will find of other petsafe systems, which do the same thing. This is a basic version I guess but I could not see the difference between the 180-299 one, (pet store price is 299) one and the 130 dollar one. I bought extra wire, which I did not need, but I am still glad to have it in case I have to replace wire at some point.
Update: It has been over 6 months now and we love love love this system. I wish I bought this years ago. The dogs NEVER cross the shock lines, even when we have the collars off now after a bath. I am truly impressed and amazed at well this worked out. It solved all kind of problems I have been having for years.