I'm not vouching for the original "Gear Wrench" but have both metric and standard sets and pulled ridiculously hard on the 18mm wrench to the point it popped... And the darn thing still works!
Huge timesaver's on some of our equipment regardless of the brand of wrenches, sometimes there isn't a socket deep enough for an impact gun.

 

The SK design is fascinating----if the real thing is half as cool as the video presentation that might be a game changer.

Of course to really test their higher strength claim I'd like to use a 3/4 or 19mm end on a stubborn bolt with a cheater bar attached. Any damage done would be all on me but that sort of abuse can suggest how it would hold up in normal non-abused use.

The 1.7* arc swing would be amazing in tight space use.