Pros
+Great ganking (Stun)
+Unstoppable late game
+Crazy clear speed
+High mobility
Cons
-Extremely hard to play
-Incredibly squishy
-Often recieve hate at match start (Never at end :D)

Start gromp (with help) and insta smite for poison buff, take wolves (stun big and kill tiny then stun and kill big), take scuttlebug (ward+heal if you didn't at wolves), take blue (kill small first and run away until just big if you low on hp) RECALL

Early game is incredibly weak but you can still gank someone with the stun if YOU ARE POSITIVE they can't kill you. This build is really,really high risk but even bigger reward.
Always be checking map and warding positioning is key, always be on the look out for potential free kills or gank opportunities with your amazing ultimate. The ultimate is great for taking turrets when creep wave is pushed and everyone is distracted. If you are in bush after taking turret or kill and people are coming ultimate away do not try stun unless YOU ARE POSITIVE you can kill them ^^.

Hide in a bush and stun, honestly that is the optimal engage in a 1v1, You can still stun in lane obviously but doing it from bush or flash stunning is great. You shouldn't really start any semi-serious engage until runaan's hurricane. Mid and late game always be looking for lanes to push and turrets to take while your team is engaged.

After you hit Beserkers Greaves you will have mad speed but no damage so the moment you get Guinsoo (Get pickaxe first) the on hit affects are mad. By the time you get frozen mallet you are pretty much unstoppable with ganks and fights.