We recently had a massive subdivision built directly behind our home, and to add insult to injury, they decided to open my dead end road to this monstrosity of cheap housing. Now we have dozens of cars traveling on a formerly dead end street and they aren't 'road wise' becuase for the past 8 years, they haven't had to be.Installing a chain link fence for 575 feet is anywhere from $16 - 25K. No thanks.This is a decent unit - not the first one I've had - but I'm impressed with the unit's construction and features.I know there are plenty of folks who won't ever use the "static" feature (the actual "shock" feature) and I've rarely used it in the past, except to initially train the critter on the tone, vibrate and zap features. It doesn't take long, the amount of "shock" is set to just get the pooch's attention, not shock the dog. After that, a tone usually works, and the vibrate feature does what the shock setting does - gets their immediate attention - without the shock. They also provide a video on boundary training and I strongly encourage anyone who orders this collar/fence to watch that video. then watch it againg.I've got 575 feet of yard to do, and this unit provides 500 feet of coverage, so I'll have to shorten their running area by 75 feet. Not a big deal since 500 feet is a lot of space; likely far more than most folks who're considering this collar will need.Two quibbles I need to mention here, and neither of them are dealbreakers:1. I can't tell if you're able to add another collar for a 2nd dog; I gotta believe you can, I just didn't see mention of it in the instructions.by the way, you'll want to read the directions. It takes a bit to figure it out and dial it in, and the instructions walk you through step by step. It's easy, just make sure you read those directions first.2. The biggest issue for me with these kinds of boundary "fences" is that if you have a dog like one of mine (a mountain cur who is a squirrel/mole/coon/tumbleweed chaser, and especially one who has roamed a bit prior to setting up the fence) and they chase anything across that boundary, they won't be able to return because the fence doesn't know which side of the boundary the dog is on.I think if the dog hasn't roamed beyond property lines previously it won't be as big a deal. That said, if you have dogs like Curs, Hounds, Corgis, Aussie Shepherds; dogs that herd or hunt - all bets are off because once they become fixated on their prey, very little will pull them off of it.Overall, it's definitely a decent unit and worth a try. The main thing to remember is that proper training and reinforcement is going to be a must, and it won't be a "one and done" effort. If you love your pets like family members, you already know this.