How does this reduce the staff required? (Or is it 1 person with a queue of 200 people instead of 4 with queues of 50 people)
Surely you'll still need to queue to bag drop, get your passport etc. checked, bag weighed to make sure what's on the tag is correct etc?

I self tagged my bag using machines in ARN for Norwegian. Even with the instructions on the 3ft long bag tag, I couldn't affix it anywhere near the standards of the check-in staff.