It's especially annoying when you're waiting for ages for staff to show up, and they're not actually busy, they just haven't noticed, despite the BIG FLASHING RED LIGHT on top of the mast that every self-checkout has, EXACTLY for the purpose of alerting staff.

I do like them though - they're generally quicker, there's less of a queue. But if I have things that need weighing I'll go to the staffed checkout.