To all adc's don't rush Essence Reaver
http://vignette3.wikia.nocookie.net/leagueoflegends/images/4/40/Essence_Reaver_item.png
Essence Reaver is an lategame item. You will useally get it when you already have some crit from your other items. Example:
>>
>>
>> 
Right now is see to many people rushing it. Just don't do it if you want to win games. The core of an adc build is still:
- Core Damage Item (
,
,
, ...) - Boots (
or
for 
- Attackspeed item(
, etc..)
40% crit 30% cdr.......
and you now have 40% CDR. dont even need to finish triforce to get 40% CDR like i originally thought. kinda stupid not to get it first.
where rushing this
needs the CDR and mana regen from ER to do much of anything. He doesn't use Triforce or BoRK very well, and rushing IE limits his waveclear and poke potential since they don't scale that well with crit.