I have a set. They work OK. Better than a standard hex, but maybe not as well as pounding in the next size up Torx.
I bought them because I had a Mercedes fan clutch that was stripped, I needed to get it done that day, and I don't have a Mac guy in my town. O'Riley had the Zeons in stock in stock.
Nothing ended up working in my situation. After the Zeon failed, I ended up pulling the radiator and pounding in a torx socket, and that broke too. Ultimately, I ended up die grinding the head off to get the fan clutch off and heating and welding a nut on.
I think if used after the the first slip, or on smaller fasteners when they look and feel angry they would be beneficial.