Originally Posted by CSZHUNG
i still think instant repositioning wins over spellshield.
spellshield might save your life once, but when 4 enemies are on you it doesn't help much. an instant blink putting you a distance away from them will.
in addition, spellshield is useless in a teamfight, while instant repositioning to hit that ad or ap carry is much more useful.
Late game yes, instant reposition does win over spell shield, but early game Sivir's spell shield also provides mana sustain, which allows her to dominate opponents with her spells.
It's actually the reason why Sivir counter's graves. Not only does the shield stop the burst, it also regenerates her mana. So long after Graves has blown all of his mana, Sivir will still be topped off and chucking BBs.
One of the other benefits of spell shield is that it doesn't interrupt her actions nor does it delay other actions. Graves, Ez, Vayne, their mobility abilities all interrupt their actions and provide a small delay to their current auto attacks.
The reality is that if you're good with your positioning, you won't need to reposition. A lot of players say that Flash is a crutch for bad positioning, and it's true. There have been games where I've been on my A game and I never touched the flash button once. So if you master that, and you use spell shield instead to block things and maintain your positioning, you'll be fine.
And again, having a spell shield instead of a reposition is still better than having neither (looking at Ashe and Kog)