Rugged? Not so much.
So yeah, obviously this is better than the cable included with your Variax, and better than just a regular ol' CAT5 ethernet cable, but I've gone through three in nine months. I play regularly on the weekends, and put these cables through what you'd expect from any regular guitar cable, and they are not holding up. And these sound just as bad (worse) when they fail as a guitar cable does. Since this is THE ONLY cable available for your Variax, seems like they could make it to last. These cables appear to be stout, but my experience (for 30 bucks a pop) has been disappointing so far.