Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
So as i have never played Vayne, this build is to help out a friend who just started playing LoL. Seeing as i haven't played her, i have however seen some good vaynes and based this build off a few of theirs. Attack speed is essential to vayne and success with her. IMO cloak and dagger will help out more then a banshees veil, due to the tenacity of the item.