I've seen their ads and finally saw a unit at a pet store. They advertise, "quality at a low price" but make no clarification on what level of quality. The unit I saw in the store reminded me of the lower end collars back in the 90's. It would probably work decently for the dog park but I wouldn't trust it on an active hunting dog. That's providing the shielding from other electronic transmitters is sufficient as that was a problem years back.
I figure one gets what they pay for and this collar might work out for those who do not place much demand on their equipment. For me, I'll place my trust in the proven companies.