SpotOn GPS Dog Fence Collar - Long Battery Life, Wireless & Waterproof Virtual Dog Fence System with App Control | Accurate All-Terrain Tracking for Medium Dogs | Perfect for Backyard, Hiking & Outdoor Adventures

I know this thing is a bit expensive. I have wasted money on cheaper GPS collars, and after too many bad experiences with a lost puppy and a failing GPS tracker I decided I must get the best available collar for this one dog, Billie, who is not satisfied with just the 20 acres of land she has to play in. After many hours watching youtube reviews on collars, i settled on the SpotOn. After several months using it, i am 100% satisfied.Setup wasn't too difficult. I think watching youtube videos prior to getting the device helped my understand what to expect with the setup and training. Highly recommend investing some time with that for anyone getting this collar. Especially when accounting for GPS drift, which is a limitation of GPS technology not the collar itself.I tested the collar on myself before starting to train Billie to it. The GPS is more accurate than I've observed on other collars. The audio notifications are immediate, and the app notifications are very fast. Within a couple seconds or less. The app also keeps track of any time the collar crossed the boundary and give you status on the event like time out, time back in, how far they traveled, and tracking information on a map.The app provides a training program for teaching your dog to the fence boundary. My daughter is a professional dog trainer and confirmed the program is good. So I went with it. Billie picked up on the fence boundary so quick that I never went through to the end of the program. Billie quickly figured out that the virtual boundaries are aligned to our farm's perimeter fence, and she doesn't go near the fence line, or gates any more. I didn't even bother with the electric static correction either.I saw how effective it is this morning when all four of my dogs were chasing after a deer. Three of the dogs went through an open back gate and after the deer onto a neighbors farm (these three always come home). Billie on the other hand, stopped about 20 feet from the gate, then turned around and layed down. I couldn't believe that her training to the virtual fence would overcome a prey drive, and I never specifically trained her to that back gate!Love that the fence boundaries are downloaded into the collar so even when cellular signal is out the GPS will still correct her if she starts to wander. But, despite cell signal being spotty in my rural area, the universal cell service on the collar has not failed yet. Big plus on both over cheaper GPS collars.The collar is stout! I am not worried about it breaking off like my last collar did. Although a bit bulky, my large dog doesn't mind it at all. The way that it's designed, the larger components are on the opposite end of the GPS and Cell receiver, so that are always pointed up towards the sky when the collar is on. And the GPS works great under heavy tree cover.I've seen some negative reviews about people's dogs being corrected when inside the house. I made the home zone much larger than my house so the collar turns off once Billie reaches the yard. Who needs to track their dog in the front yard anyway?I've also seen complaints about location update frequency, which i think is people misunderstanding functionality. When the dog is inside the virtual fence the tracking status updates every 5-10 minutes, which I guess is to save on battery life. But as soon as they cross the fence boundaries, it immediately switches to real-time tracking. While inside the boundary, the app allows you to refresh location any time, and you can turn on real-time tracking at any time, which also shows your location on the map as well.Yes. 100% satisfied with this GPS collar. Would recommend to anyone without any reservations.