I use the fork out of em. I have years of cashier experience so it's a rarity for me to ever not get out more quickly using self checkout. I do however agree with OP that it sucks badly when sheet doesn't work correctly since customers will never be given any leeway to do their own voids or other authoritative measures (out of the store's fear of ppl using it for theft) so then you're stuck waiting on the self checkout emperor to come and fix something you could've fixed yourself in 10 seconds if given the necessary authority.