I had a long conversation with a guy at Berg's ski/snowboard shop last night who tries out all the gear. He has tried them all out and I mentioned the weight of the ctx's compared to the gnus. He had a digital scale and the ctxs are .2 oz more than the gnus - pretty much the same. He also likes the ctx feel a bit more than the gnus, if you like feeling tight in the binding. He had me leaning back towards the ctx binding for the cantilevered bed, i have a short instep so consider my stance pretty wide.
Don't you just love true facts over internet dribble that is handed down as facts. That will go a long way to explain why I don't feel any difference in the weigth of these bindings.. Because there isn't any.