Just to be clear... the flash they did with the IMRC "fix" & flash is different from the PCM flash to help improve acceleration smoothness (and turbo lag surge), which was done several weeks back for me.
Since the IMRC fix and flash I haven't noticed much difference. Maybe I'm getting a tad better gas mileage (but it's a small and could be chalked up to other things). Car is running great and so far no CEL.