Pro:
1. You can gain all of your life back when almost dead.
2. Your Attack Speed is fast, very fast.
3. Your AD is so strong, 1 hit with Rampage will bring them down fast.
4. Clears minion waves fast and easy.
Cons:
1. Might not be much of a tank as most people want.
2. There are no other cons.

The reason you get rampage first is cause it does more damage than your basic attacks, or the other skills. You would want to max E by level 13, but not level 9 because your other skills help you more that maxing your E right away. Getting Devastating Charge at level 2 can help harass the other champions, also saves them from dying.

Farming minion waves with this build helps a plethora when you need health. Your health goes up fast when you have the Attack Speed, and Life Steal. It helps you out of sticky situations.