User blog comment:TheTobarMethod/So...Tri-Force Vayne lol?/@comment-149.119.230.119-20130304012138

You're better off with getting a defensive item or Last Whisper. Your DPS isn't significantly higher with a trinity since the stats are all so small. You also entirely waste the ability power. TF is too pricy to build up, given how low all the key stats on it are. Vayne's base AD also isn't very significant, so the sheen proc isn't exactly amazing. Just get a GA/QSS or Mallet.