MSP-SEA 757-300. The Fly Delta app kept buffering when playing a movie. Switched to the GoGo Player and it played without any hiccups.

iPad Mini. Installed the GoGo Player from the App Store before boarding.

There is a Fly Delta app update available from the App Store that includes Delta Studio, but the GoGo Player works better.

The GoGo page rejected my first name/last name/EC seat number input until I included my middle name in the first name field. Then the movies were free.