At about 4:00 into Zwift video I (K.Poukhov) was chosen as a guinea pig by reviewer.
http://www.cyclingweekly.co.uk/fitness/training/zwift-watch-depth-preview-revolutionary-turbo-trainer-game-video-150151
http://www.cyclingweekly.co.uk/fitness/training/zwift-watch-depth-preview-revolutionary-turbo-trainer-game-video-150151