I used the app for the first month of Snapshot and just switched to the plug-in. It isn't a bad idea, but I feel there are many bugs to work out. Primarily with the "phone usage" part of it. There were many times where I would be sitting in a parking lot after a drive, not moving, but it's like the GPS needed a minute to catch up, so it flagged me for phone usage thinking I was still driving. The maps also don't seem to track well, thinking I was a street over when I was in a drive-thru.