Pros

Great mid game
High burst potential
Can kill their carry quickly
Clone! - Deal more damage, take less, deal more when clone dies

Cons

Awful early game
Not so good late game
Squishy, very easily killed

The first skill is a very useful one and is easy to learn.

After you have Stattik Shiv, you can Q --> Auto-attack --> E for great damage to whoever gets a little too close. The Stattik Shiv passive will always critically strike for 200 damage, even though your Q may give it a different critical % (140% at level 1.)


The second skill to learn is how to use your ultimate.

You want to lead in with your ultimate, and move around so that your clone takes more damage than you while stile dishing out a bunch. This is very difficult to explain what exactly to do, but with practice you will become very good at it. "It's always the wrong Shaco!"

The third skill to learn is to use your passive! This can be very easy or very hard depending on the person.

You have to make sure not to give too much into trying to backstab because you don't want to get caught out. It's great if you can pull this off using your first skill, but I wouldn't try it until you have gotten good at backstabbing and good at the Stattik Shiv skill.