Very worth it, Wits End is better if you are being more defensive, but overall Static Shiv is great because of the synergy with his passive. If you are snowballing get IE first, otherwise static shiv should come right after wriggles.
On a side note Youmu's needs a buff, BC just outclasses it so hard now. Ghostblade is only good on shaco because the active works great with his Q as a getaway
"The only people who should shoot, are those who are prepared to be shot at."- The Great Emperor Lelouch Vi Britannia