And I think Riot should pay a lot of attention to this article. It really explains some of the item choices and why they just don't flat out work.
I also want to bring Haunting Guise to mind. It is a great mid game item, but a very, very poor late game item, and I really think it needs some addressing, just like how Hexdrinker was addressed.
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Guise is an awesome item. It serves it's purpose and I do agree that it should have an upgrade option.
But the thing is, if you have mpen marks (like you should) mpen boots (again basically every ap mid gets these) AND guise, you are dealing true damage to everyone early game, most people mid game and you negate about half of the enemy carries mres late game.