Only a few cases I found where it seemed OP, but it wasn't anything to unbearable.
is one case due to how his E works. But if he's going full glass cannon to take advantage of it, any form of stun or snare and he's dead before he can get one auto attack off.
due to her Q, it can get some serious burst with devourer, but its simple. KITE HER. Her only gap closer is on a high cooldown and is rather easy to walk out of.
Sure the item may be strong, but its not suddenly making Yi invincible, nor does it make Shyvanna have a better way of getting to her targets.
In short. The item is strong, if you let them use it. They still have built in weaknesses to take advantage of.