I just played a game against X/d defenders with ion cannons. As if the legal game mechanics were not brutal enough, my opponent insisted that ion tokens deny actions after the white 1 straight maneuver. I hesitated to push the issue and didn't want to appear to be a rules lawyer but upon reading the rules after the game, I confirmed my correct knowledge of the rules. I'm certain it cost me the game, or at least made it far worse than it should have been.
Anyhow, my opponent was a nice person and I can't believe he did so out of any malice, but I learned 2 hard lessons: 1) ion tokens are bad but not THAT bad, and 2) if you are pretty certain about a rule, go ahead and dig out the rules.