Hello Gibbo,
We actually have a skirt that can be fitted to the bucket which gives it the same drop pattern as a bambi. I am not to sure if you would have seen it in use though.
Another advantage that our bucket has over the bambi is the ability to vary the amount of water uplifted. A great thing to have when freshly refuelled as we could release water until the machine started flying, as the gas was used more water could be carried (1100 litres max). A bambi is restricted to what the helicopter can uplift with full mission fuel.
When using the scoop technique (below) our bucket is just a fast as the bambi (when uplifting the same amount of water that is). Takes a bit of practice to perfect.