This service is a fantastic way of giving valuable, multi-dimensional feedback on videos of any kind (this specfic use case is pitches, but could also be applicable to interview practice a la many of the submissions for Challenge 4). The basic is that while watching the video you can give live binary feedback via the Green and Red arrows for parts you like and dislike, as well as give specific commentary tied to specific timestamps in the video (fairly reminiscent of live sentiment trackers during debates).
This is a much simpler system for both the givers and receivers of feedback. For those rating the video, you can save time by doing it while watching the video rather than have to remember your specific thoughts and rewatch multiple times. For the video creator, the feedback is more accessible (no parsing of long google docs) and better aggregated (you can see if everyone who gives you feedback likes/dislikes a specific part of your video).