For good quality YT views you need the user to watch as much of the video as possible (called high retention views). AddMeFast only requires the user to view for a few seconds before closing the pop-up. So the views are absolutely terrible. It's pretty much the same as having a PR0 link compared to a PR8 link. The higher the retention, the better quality the view. I use AddMeFast for building up on likes, favourites and subscribers.