Originally Posted by Pointyleaf
Not quite - my understanding is that CoS cleanses UA, procs it, but it usually gets resisted. I haven't tested it personally, though, so.. grain of salt.
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Currently Vanish and Cloak of Shadows have similar mechanics
1) For a very short period of time your made immune to the mechanics they remove. For CoS this removes all magic debuffs, for vanish movement impairing and snaring. This is also why rogues have very rare screenshots of being immune to things they normally shouldn't be.
2) You gain buffs, for CoS the -90% to be hit by spells, for vanish you gain sanctuary momentarily (kicks you out of combat) as well as stealth and the +stealth buff. The infamous "autoattack out of vanish" bug occurs when somebody attacking a rogue sends a autoattack swing to the server just as its receiving the message that the rogue vanished. The server resolves this this as both abilities (vanish and autoattack) succeeding, leaving a disappointed rogue.
Immunity effects do just that, make you immune, not give you a 100% chance to dispel. When a paladin bubbles out of UA they do not get a resisted message for the UA proc, just like a rogue that uses CoS doesn't.
Improved sprint and escape artist, as others have pointed out, do not use a immunity cleanse like vanish, so they are subject to the 1% natural spell resist rate as well as other -resist talents and abilities.