I love the built-in sensors, and the option of easily integrating that data (i.e speed, heart rate) into the video.

I'm not an action cam user, therefore not sure why a built-in media server would make a difference to edit video without having to download it first. Though, I'm a loving Tomtom multisports watch user and know that Tomtom makes lower price point alternatives, functionality wise not far from its competitors.