Pros:

Easy to farm against melee champions.
High base damage.
High mobility

Cons:

Hard to hit third "steel tempest" (Q)
Poor laning phase.
Hard to lane against ranged chamions.

Early farming is kinda hard, because Yasuo doesnt have much wave clear. When you get your core items you will destroy the enemy laner.

Sorry, this is my first guide. I know it sucks but I tried...

If you want you could go 18/12/0. But I recommend that you take these masteries because Thunderlord's is so strong at the moment.