I grew up with a regular fence and now my husband and I have an electric fence for our black lab. I agree with PP that the fence works great for the right kind of dog. Labs don't challenge much, they are happy to stay where they are supposed to, but another breed might not care about the zap if they are focused on chasing another dog or squirrel, etc.
The price is right. So if you are mostly price motivated, i think this is a great option. Also, if you don't leave your dog outside while you are NOT home, this is a great option. We keep our dog in the house when we are not home. He is only out in the yard when we are here to keep an eye out. He doesn't really wear his collar much anymore because he is so trained by his boundaries that he really doesn't challenge it. Every once in awhile he wanders and we put his collar on again for awhile to remind him. Growing up, a regular fence allowed my parents to keep the dog out all day while they were at work, etc. I wouldn't personally do this with an electric fence.
We had ours installed for a bit over $1000 here in CT, 6 years ago. My uncle installed them at his kids houses with an edger to dig the trench and then laid the wire themselves, so theirs was much less plus the labor they put in themselves. So you can drastically cut your cost by buying it and doing it yourself.
If you go through with it, I would recommend seeing if you can get your driveway OFF your loop. My cousin did this somehow, and her dog can't go in her driveway. I WISH we had done this because our dog does not stay away from cars, he runs toward them. Everytime we are outside and my husband comes home from work I have to chase down the dog or trick him to get him away from the car.
PP are right also in that it keeps your dog in, but not others OUT. We haven't had an issue too much because we live in the woods and so we aren't near the street for him to run right to the barrier and then stop and scare the daylights out of people walking by, etc. But we did have a dog come into our yard the other weekend. Our dog was very protective and had the other dog not been a puppy who was outrunning our dog, there would have been a fight.
Also to consider, when walking in a neighborhood with these fences, it is really intimidating when a huge dog comes barrelling toward the street barking like crazy. The walkers have no idea if you have a fence or not....it can be very intimidating! I do think it's great for people like us who are far off the road though. The cost compared to a nice regular fence isn't even comparable. The regular fence could never have been in our buget.
Good luck!