It's not a new device. It's the 4th Apple TV. No screen, not small, not held while being used means there's very little to worry about. No bending issues, antenna gate issues, screen coating issues, etc.
It'll be fine. The innards are tried and tested components based on last years iPhone 6. This is Apples 4th Apple TV based on this design (there were two revisions of the Apple TV 3.) and by and large Apple have a good track record.
If you want one, just buy it and don't worry so much