I have never entered the car without it telling me that it has recorded at least five sentry events. Today, when I tried to see what's going on, the internal viewer wouldn't function. I took the USB to my Macbook and the most recent clips on the USB were several weeks old. Clicking on video files directly launched QuickTime but it couldn't open the files. Going from QuickTime to select the files from Finder allowed me to view them. They were very boring ;-)) All in all, doesn't seem ready for prime time.