We have a vendor-installed system; cost around $900 installed, with two collars and enough replacement batteries to last forever (I swear, the guy gave us probably 20-30 batteries, and I've only used 2 in a year and a half). I'm reasonably sure it's Pet Safe brand (also sold by
Petsmart), though the plug-in portion of the system doesn't look like any currently on the Petsmart website.
We've got two dogs (~55 lb lab mix and a ~10 lb maltese) and a yard that wasn't good for real fence, and the radio fence allows both fron and back yard coverage and works *perfectly*.
We trained the dogs per the included DVD and have had zero issues since - both dogs avoid the fence boundary. The training consisted of putting yellow flags all along the fence, walking the dog along the flags, and scolding
the flags which I thought was a little weird. Over time, you remove every third or fourth flag, until there are no more flags. The total training took us about 3 weeks. The correction levels on the collars are both quite low (both are either at 1 or 2 on a 7(?)-setting scale).
One common misconception is that the collar only shocks; our system gives a very high-pitched, but low-volume audio warning when the dog comes within a couple feet of the fence - only when they continue approaching the fence do they get a shock.
The
only advantage a physical fence has, in my book, is that it will keep other people's dogs out of my yard; something a radio fence obviously won't do.