Chogie is an amazing ap champ- but alot of people see him as a better tank because of his ult stacking abilities- Cho is an amazing Ap carry in every way, and all you need to do is stack AP and land your q's.
--MAKE SURE YOU HAVE SMARTCAST SET ON YOUR Q, IT WILL MAKE THIS BUILD ALOT EASIER TO PULL OFF----

Pros
Awesome laning power, along with being the key member to any teamfight. He can easy 1v3 if fed. Huge farming potential. Short Cooldowns on all spells. Nearly unstoppable.

Cons
Squishy if ult isn't stacked. He will get focused if you try to carry the game. Very defensive early game.