So right now (icecrown realm) it's not posible to vanish instant CC spells, in additional, every hunter shot or enemy ability's been used within 0.2-0.5 seconds of the vanish performance breaks vanish.
Every youtube 3.3.5 video shows rogues evading million random abilities with vanish, traveling abilities, instant abilities, meanwhile warmane developer said that current vanish mechanic is blizzlike and ability is working as intended :
https://i.imgur.com/UIQhFsg.png
So, do we have 3.3.5 veterans who know how this spell must work for sure ?
Especially the last part "briefly visible shortly allowing players to get you".