747 Snooze Zone

Hello.
Could someone share some info on how beneficial using the upstairs cabin/snooze zone is on a 747.
My main concern is the speed of disembarkation. Am aware the top deck is shared by EC PAX but wanted to know whether UC are permitted to leave the aircraft first?
Could someone share some info on how beneficial using the upstairs cabin/snooze zone is on a 747.
My main concern is the speed of disembarkation. Am aware the top deck is shared by EC PAX but wanted to know whether UC are permitted to leave the aircraft first?