User blog comment:Krufix/Last Whisper - When to get?/@comment-5441738-20121107034504

I am not a strong player of ADCs, so I don't know how much my opinion is worth here, but:

I only get Last Whisper on AD Casters, not right-click-to-pwn champs. For example, when I play Sivir, my main damage output is based on her Q (the skillshot), so I would never get something that is based on on-hit effects like Black Cleaver. I usually rush a Brutalizer on such champions just so that I'm using their damage abilities more often and depending as little as possible on autoattacks, but I've considered Last Whisper many times.

If I'm playing, say, Fiora, it doesn't matter how much armor you're stacking; the most I will build against you is a Black Cleaver. Why? If I have an even halfway-decent team comp, you counter-building ME is only screwing YOU over. My reduced damage is little or no penalty when my buddy is dealing tons of magic damage which you have no real defense against. Plus, it's usually best if I'm targeting the enemy that the entire team should be focusing first, so having reduction over pen is really sweet.

In terms of build order, though? Again, I don't play ADCs frequently, so in every game, I'm just making it up as I go along unless you aren't counter-building at all and I am stupidly fed, in which case I'm getting whatever I feel like getting.