Chargers have the Atlas baseplate, so they are probably not even the stiffest and responsive bindings from Union (let alone in the market).
Well, the Union and C3 guys I talked with last season all said the Charger is absolutely the stiffest binding that Union makes and sells. I guess they could be wrong, but somehow I doubt it. It definitely was the stiffest Union binding I rode. I don't know that I would go so far as to call it the stiffest out there, but I absolutely would say that it is the stiffest in the Union line.