Don't buy these items. Don't do it.
NO. DON'T DO THIS. "but, but it gives attack speed!" NO. That attack speed is the false prophet sent to guide you down the dark path of the herbivore jungler. Volibear's greatest strength is his great early ganks, don't squander this advantage by buying an item designed to have you gank as little as possible. Voli doesn't clear the jungle as fast as other users of wriggles with W max, and he also isn't a damage threat like Xin or Nocturne.
I know, it has attack speed, but look, the crit chance is a wasted stat on Voli. The point of this item is actually the small amount of burst you get from the passive, and for waveclear. Voli shouldn't be the one depended upon to waveclear (otherwise your team comp has some serious problems), and he most definitely does not burst.
No, I don't care if Trick2G says it's a core item. Pants Are Dragon has the right idea, this thing isn't even on his list of alternate items. Let's count the stats that are wasted, shall we? Ability power, Mana, Crit, Attack damage does very little for Voli because he scales off attack speed better anyways. That's like 1500 wasted gold. Yes there is the movement speed buff, but what are you going to do with spellblade? What, proc it with your 20s cooldown W? No thanks.