The water hits and splashes are fantastic, however my current project needs something a little more detailed.
Some "water flow" elements would be very useful, and as far as my Google-fu can tell, doesn't exist in any competitor collections yet either.
Some examples might be dumping a large bucket of water or tank. Capturing the beginning of the stream of water and also the collision with the ground.
Large volumes of water being dumped onto objects would be very useful for a lot of artists I believe.