One thing I really like about this offering is that it has a universal ball attachment to the windshield. Too many dash cams expect you to mount directly in the center (under the rearview mirror), but I like to put the camera in a corner of the windshield. With the usual mounting, that means you can't line up your camera to a true horizontal.
I also like that you can quickly detach the Garmin camera and use it for snapshots at an accident scene. Both accidents I've been involved in during 2013, I used an HD camera to walk around and record everything. Without that camera I would have had considerable difficulty explaining things to an insurance company, particularly in the one case where the other driver made up a story.
It's very curious that in all the release data from Garmin, no mention is made of camera lens field-of-view. To me, this is one of the most important criteria, and a product like the upcoming GuardTrak GT2S (aka "Black Bunny") has a 96-degree FOV, which I consider far preferable to wider ones.