Qantas has been using them on its domestic network for some years. Either you print bag tags at the kiosk that are scanned by the automated bag drop, or if you have the Q Bag Tags[1] and have checked in online, you just proceed directly to bag drop.

[1] https://www.qantas.com/au/en/travel-info/baggage/permanent-b...

While I like them for obvious reasons, I've heard nothing more then hate on them from people around me. Every person had the same complaint that now the moment your suitcase is even the slightest bit oversized/overweight there is no sweet talking the (usually) female person behind the desk to accept it anymore.

Personally, these people overpack suitcases so often that I don't feel it is a problem. There's a limit for the people that have to carry it, it should be illegal to overpack it the slightest.