I had the in-ground fence version, but got this for a quick set up at my boyfriend's house. It is pricey, but when you consider the alternative is your furbaby getting hurt it is definitely worth the money. I got mine from the PetSafe website, but I know they are also available at PetCo. I would recommend this to dog owners who either have smaller dogs, or mild mannered dogs.
There are two things I do not like about this fence system is that it doesn't have a very strong shock level for high energy, stubborn dogs. I know they make a different, rechargeable collar that is compatible but is more expensive. The other thing I don't like is that there isn't an exact, set boundary with this. It fluctuates very slightly and can be affected by things like vehicles or power lines.