Puppy Face , Mar 02, 2008; 05:51 a.m.
Nope, I let AWB rip and correct if needed prior to RAW conversion in DPP. But it actually doesn't matter what you set as you can quickly change it in DPP, although your camera setting will open as the default. Most of the time AWB nails it, except in mixed lighting. For mixed lighting--say flash and tungsten--I use one WB setting for one conversion (flash) and another for the ambient and combine and blend in PS.
The only advantage to setting WB manually is for JPEG shooters. Fixing WB after the fact in a JPEG is a bitch. But I'm guessing not too many 5D owners shoot JPEGs a lot.