I got my sling after my bow " jumped" couple of times from my hand and landed on the ground, some " pro" guys on the range complemented me on relaxed form, and mastering surprise release. I' ve been shooting with a sling for almost a year and I didn' t really feel that I needed it anymore, but when I took it off to change stabilazer and shot few arrows I almost drop my bow again. It' s funny I don' t feel the sling doing anything for me, but when I take it off, the bow jumps or I grab it subconciously often causing torq effect.
That from my 8 months experience of shooting bow