The problem? It's still CENTRALIZED energy technology. This means, you still have to hook up to a grid and be metered. It's also incredibly expensive...
Nikola Tesla would be disgusted seeing what our energy systems in this world have come to. I will be shouting about zero-point energy technology from the rooftops for the rest of my life...
They have been promoting this for decades, and its always 5 years away.
Its had a great success in building the careers of many physicists and engineers, its very successful in attracting huge funds to pay these engineers, and it's very successful in getting peoples hopes up.
But that's all folks!