While we can't speak for retail units already out in the wild, our specific test unit fails to wake properly after closing the lid or entering sleep mode. We recommend owners out there to double-check this or share your experiences below as it's possible that we simply had a bad luck of the draw.
https://www.notebookcheck.net/Buying-a-Dell-Latitude-7400-2-in-1-Initial-batches-may-have-wake-from-sleep-problems.421220.0.html