User blog comment:Hyperion602/A new way to play Vayne/@comment-8506165-20140217192540/@comment-13944607-20140217203233

The reason I took it over, say, another Phantom Dancer, or a Shiv, is that i wanted  the bonus health, while still getting a reasonably significant bonus to damage. A Shiv or PD might give me more DPS, but not more tankiness. Plus, the Armor Pen from the BC applies for everyone on my team, so it gives me some utility as well.