I got a Contour Roam 2 as a Christmas present. I've been trying it out on the way to work, which is not ideal as it is pitch back when I leave but I have uploaded some samples of when I got closer to work in different formats.
The four samples were at the same time of day on the same stretch of road but were on different days where the light was a little different so they are not a perfect comparison. The time was about 8:45, and all done over the last two weeks (early January), so you can imagine that the light was pretty poor.
All four were recorded in High quality on the Dusk setting.
Full HD - 1920 x 1080 30fps 111 degree field of view
Tall HD - 1280 x 960 30fps 135 degree field of view
Action HD - 1280 x 720 60fps 135 degree field of view
Contour HD - 1280 x 720 30fps 135 degree field of view