The Amazon Marketplace includes all products sold by sellers separate from Amazon. These third-party sellers may offer better deals, used items, and competitive shipping charges. Plus, Amazon guarantees the condition of your purchases. Some sellers do not qualify for free shipping under Super Saver Shipping, but they do offer free shipping to Amazon Prime members. Take special note of this when comparing prices between sellers, and even with similar sellers on eBay and Craigslist.
I do not like the security of this apps. By default any one in my home can just open it up and start buying things on my account. I would like it to just add things to my cart on the TV and them buy on "My" Computer or "My" phone. I know you can setup a PIN for "videos, purchasing and certain types of content".But, you then need to enter the PIN for $0 videos. Also, anybody with access to the Fire TV remote can just install the apps and start buying things, no pin, no password, just because you have a Fire TV setup on your account. Amazon you need to have a separate PIN for Buying videos, parental control (ratings), Apps and Shopping. And by default the app should setup a PIN.