I know I'll need to run some tests to confirm, but I just downloaded some video from my NEX3 to my MBP. The audio and video are out of synch. I'm using a Transcend Class 6 8GB SD card. Is there any reason that speed class should be too slow??? Like I said, I'll have to later tonight, try playback on a different computer, reboot my MBP, try some new test movies. Just wondering if anyone has experience and that I need a faster class SD card for some reason.