You should also consider the Sigma 10-20 f/3.5 - it's got generally better IQ than the variable aperture version, and is newer. I sold mine after moving to FF, but i loved it.
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Another funny thing I found was that even if the grip is turned "off," the camera body turns on and still functions completely fine. I wonder if this is part of the battery drain problem.
Here is a link to an original RAW file for those who'd like to play with it !!
Taken with the 70-200 2.8L II USM, shot at dusk.
Camera Canon EOS-1D X
Exposure 0.001 sec (1/800)
Focal Length 200 mm
ISO Speed 10000
AZ3P0176 by PVC 2012, on Flickr
Mine works (and is still attached), but i find it's overly sensitive and it's really difficult to navigate menus unless i'm holding the camera just right, and really focusing on how i'm pressing the controller. Like, the slightest touch sends a left or right command/
If you have the battery grip, turn the switch to off. For some reason, when my battery grip is turned on, the main joystick is super sensitive... if I turn the grip controls off, then it works like a non gripped unit (ie, better).