Should it still be rushed for champions like Vayne and Trist?
IMO you shouldn't rush an AS item with a champ like Trist who has an AS steroid. She is much better off with a BT.
But it's also an on-hit-effect item, which is naturally good on high AS champions...
On Vayne I absolutely would. Because of her true damage nobody with a brain is going to build armor against her, so you need to counter the high health.
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