I'd give the unit 5 stars, except that I can't be sure whether the relatively modest power my meter reads is due to some fault in the fence (I can't find anywhere that it's shorting), or because the unit isn't as powerful as stated. I'm getting 5,000 volts consistently on about 3km of solid-core exposed wire, but I was expecting double that. It's still a jump up from the old unit, but less than hoped for. Other than that, it seems to work well, arrived promptly, and was easy to set up. We'll see how it pans out over time.