originally posted on Real World Workflow:

Update: Capture Integration has posted a series of tests with the 1DsIII on 10.5.5 and 10.5.6. The results are that 10.5.6 is almost twice as fast as 10.5.5.

http://www.captureintegration.com/tests/canon/

I’m still hearing people are having trouble with installs (use the combo updater) and various bugs, so don’t make the jump until you’re absolutely sure that everything is good, or you need to tether the 1DSMkIII and are willing to take your chances.