I have a cheaper dash cam in the Zed and for the money I'm very happy with it.
This is a picture at speed and the reg ahead is clearly visible. My phone is only 720p so YouTube will only go up to this and he quality of the recording on my laptop is double as sharp as was recorded in 1080p 30fps. The image has gone from device, to phone to YouTube, screen shot in my phone again then uploaded to photobucket.
Again no issues with my Amacam AM-M81