I love mine, especially coupled with either the 85L or 24-70L. For custom functions I did custom white balance settings for several of my main light/modifiers, Mola's, Octabank, Deep Octa, Elinchrom with open reflector.
Then I set my follow focus speed in the center of the diagram, I've worked it all over the place but this works best for everythng I do, which is portraits, often shot at a wide f stop with the 85L with one of the outer focus marks set on the eye closest to the camera and I am set in Al Servo when I do this.
When shooting outdoor walk around portraits where we are always moving and changing, I often turn on the Highlight Priority just in case. I'll shoot these at ISO's anywhere between L (50)and 400 ISO.
I swapped out the standard groundglass for the one that is for manual focus, it works fine for everything else including I used it a lot with the 100-400. I like it because I shoot a lot of table top still life stuff and Iike to set my focus manually.
I seldom install an SD card, only when it's going to be kind of fast and furious and I want backup. Whether I do or not, I always shoot in RAW and when I download, it's into Lightroom 3.
For Picture Styles (yes I know I'm shooting RAW but you can have LR3 set so that the default image comes up with whatever your style was and mine lately has been set at User Def 1 (custom) which is Faithful with the sharpness set at 4, I got this from some wedding shooter someone sent a link for here on the forum and it works for everything and doesn't look at all overdone.
Image review time I have set at 4 seconds.
Beep turned off
Shoot with no card is turned off
Histogram I have set on brightness
Metering is set on Evaluate and it stays there.
I shoot at 2nd curtain sync but can't remember why - it seemed important at the time.
High ISO speed noise reduction is turned off, can't beat LR3 for noise reduction.
ISO speed setting increments I have set at 1-stop, I don't want to mess around and this works for me.
Highest ISO speed setting H
Lowest setting L
Safety shift, disabled
Flash sync speed in AV mode is set to Auto
AF expansion with selected disabled
CFNIII-9 set on 3
CFNIII -10 set ib /disable
CFNIII - 12 set on 2 when focus achieved
CFNIII - 13 Brighter
CFNIII high 10 shots
low 5 shots
CFNIV - 5 #1