User blog comment:Care Level/Itemization Holes/@comment-1245534-20130825005423/@comment-4022742-20130825091633

Think about synergy though. When you take armor penetration on something like or  you become way too strong early. Especially the latter one which will completely remove any armor you have at level 2 and deal true damage to you with his tripple chop. Basically instagibbing you with ignite.

Why vamp scepter was op? Because you could buy it at level 1 without having to spec 3 quints in Lifesteal to get 6%. You got 10% of all your damage dealt, meaning you could spec damage in your Quints. Where you can get 6% LS and 10 Damage now, you could have 10% LS and 7 Damage. On top of that, the longer you can stay in lane the more farm you can get and the better and faster you scale to late. Without the level 1 sustain, you can't do that as efficiently.

And why not 5% CDR? For cases like who basically scale of the amount of Spam they can deliver, which would make him quite strong early.