Great if you have apple or android. Useless if you use a Windows laptop or tablet or any laptop for that matter and for some people with slow daytime internet this would be great for a PC set it to download overnight and watch during the day but again it only works with iOS or Android.
Now if only they would have an app for video in the play store for Andriod users. I know there is a way to get an app but I would rather not have to jump through a bunch of hoops to get it.
Amazon seems to have issues developing and maintaining native Windows apps... Several of of their services could benefit from one and have never had the option (Prime Music etc), others had one and it was EOL'd like their consumer/Prime cloud storage plans.