User blog comment:V3hemenc3/Skins that give you Disadvantage/@comment-3974211-20120923162557

I don't know about disadvantages, but the following are advantages for the player:
 * Bandit Sivir's boomerang is considerably more difficult to see than her other boomerangs.
 * Monarch Kog'Maw's hitbox is considerably smaller than his model, due to the wings mostly not counting. His model size was actually shrunk to fit more of the wings within the hitbox, but short of making him the size of a grain of rice it'll never fit.
 * Frostfire Annie's Molten Shield is almost entirely solid, making it next to impossible to see where Pyromania is active.

All of Shaco's skins originally used the classic's clone model, and so using any of Shaco's skins would have actually disadvantaged the player. Just a bit of trivia, as this is no longer the cast. :)