Just a heads up for those sitting on the fence about do they/ don't they.
Samsung has just replaced the display on my S9 in warranty for burn in.
I was advised to go to my nearest Samsung experience store, where they took the device and booked it in for the repair.
They will not do it under warranty if the device has damage.
The burn in repair requires authorisation from Samsung so can take 24hours.
Part of the process involves replacement of the battery too (which is stuck to the rear of the display housing)
Must say, after 14 months to get it repaired under warranty is a real customer focussed solution and is a real positive step in today's oled age.
Kudos where it's due, and today it's due at Samsung's door.