Got me for a minute!
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I now use the Canon 2x III on a Canon 70-200 f2.8 IS II, and I am very pleased with the match.
The Canon 2x III doesn't show the ugly OOF-artifacts I observed on the 1.4x II.
Just wondering which HDR Software you like to use the most? For me its Photomatix 4!
My usage would be weddings plus typical insect and floral macro shots.
I've got the 7D, but to me it was so far off I didn't think the micro-adjustment would work. I also called CPS and the guy wasn't sure if the microdjustment would remember the lens/extender combo as it's own lens, or if it would remember it as the 70-200 II. I'd say 15 feet off at 90 to 100 feet.
AFMA values are stored separately for each lens + TC combo (and with newer cameras, by serial number as well, so you can have more than one of each lens or TC type).
Each unit of AFMA is 1/8 the depth of focus, so with 20 units you can correct for 2.5x the depth of focus - that's a fair bit of latitude in the correction.
What camera are you using it with? Some of the cameras have micro focus adjustment which lets you tweak the focus and saves it for that lens and extender combination.