Well, the product launched and I must say I am disappointed. I definitely won't be buying one before reviews come out...
The pros that I can see to this product are: 1) always knowing where your pet is 2) the peace of mind if your pet does escape 3) if the battery dies and your pet escapes, there is a backup battery.
The cons that I have noticed so far: 1) you have radiation entering your pet at all times, as the product turns on every couple of minutes. The manufacturers stated it is about 1/10 the amount you get from your cell phone, but even with cell phones we are told not to have them on our person. This would be constantly around the pet's neck 2) there wasn't a whole lot of information about the collar and how it would fit, or if it was designed to break off if your pet got stuck. 3) it is quite expensive, and has a $10/month charge to run the GPS (which all of them do...I am still waiting for one that doesn't) 4) there were some very rude comments from the makers in regards to consumer concerns about the radiation. This product hasn't been made yet, and if they aren't interested in consumer concerns, than I personally question the safety of the product.