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Rob, 11.1% probably refers to the area of the secondary compared to the primary - equates to deceptive advertising. 4"/12" = 33% sceondary obstruction by diameter, which is about the same as my C11.
You'll still need to tweak the collimation regularly on the SCT to get the best high power views - and you'll certainly need to add some kind of active cooling if you get the 12" Meade and high power is the priority.
The Meade 12" also weighs about 38 lbs while the Celestron 11" weighs about 28 lbs.
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