They were fairly effective. The two big advantages were range when using larger projectiles, and ease of use - an ordinary sling takes a lot of training to truly master.
On the other hand, they lacked precision/accuracy and speed compared to ordinary slings.
Staff slings actually lasted a bit longer in military usage than ordinary slings because they can throw much heavier projectiles, but that's a double-edged sword (ha) - projectiles are something that have to be carried on the march. So they remained mostly in specialist applications, like naval and (defensive) siege warfare, where stores of ammunition didn't have to be carried by hand or pack animal, and in regional contexts (like Spain).
Thanks for the picture. Can anyone explain in detail how the staff sling works and how effective they were? Just curious.
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