User blog comment:TheTobarMethod/So...Tri-Force Vayne lol?/@comment-84.183.47.247-20130303014540/@comment-4593717-20130303194615

Vayne is one of, if not the best ADC in late game. Derp.

I also agree that BT and IE give more offensive power, but not for bursting, which you might consider if building Vayne Assasin-style (which I highly recommend because ganking mid and bursting down the enemy mid with your APC (supposing you have one) is a really nice way to get Vayne the snowballing she needs to become a monster and basically single-handedly win the game for your team.