User blog comment:Kygehn/Wuju buy a Yomuu's?/@comment-1985493-20131226045347

I don't know about buying Yomuu's on Yi (I don't know about playing Yi, either), but I know it would be a grave mistake to get it on Garen rather than getting Cleaver. Cleaver almost insta-stacks on Garen and Yomuu's is very all-in-ey which Garen isn't very good at being (unless you go glass cannon, which isn't recommended due to his power with defensive items). As for Riven, she can benefit with it due to have enormous mobility and increased burst between crits and applying her passive. This brings me to Talon, the only other candidate who I feel should get a Brutilizer item as a core part of his build. Yomuu's is way better on Talon because by the time Cleaver is fully stacked with him, your target *should* be dead (or you will probably already be if not) and the health is just about useless on him whereas the crit is actually pretty nice. With Yomuu's Talon can pop its active with his ult for an insane speed boost, at which point he Cutthroats and combos a squishy, causing all of his ulti-blades to cut through your target so no damage is lost. TBH, the attack speed given from Yomuu's active isn't anything to get lost in; it's one-third of the tri-force that Yomuu's brings up from Brutilizer. Also, Cleaver (and potentially Yomuu's, I suppose) is a good item for Zed, but only after he's already got everything else he needs.

All in all, AD casters should no longer buy brutilizer in this iteration of the game as Hydra is a more valueable and effective item for the waveclear and burst it provides unless you are planning on Yomuu's or Cleaver being part of your build. You just flat out get more out of it (unless you're Garen, in which case Cleaver all the way).

TL;DR: AD Caster? Buy Hydra.