Spear of Shojin - Viable on which champs apart from the obvious riven/renek/jax etc?

Anyone tried it on kled? I realize bear trap would be up after the initial engage soon after W goes on cooldown even without it, but how about in lane? QEW then R immediately after w goes on cooldown to have w up again real fast and the 50% AS bonus. Might not be bad on panth I was thinking since he usually ults into 2-5 players. What about olaf? His E spam could be insanely fast. Volibear? Wukong?
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