[plg94]

It depends how the self-checkout is executed. In our one supermarket here in Germany (Globus) each customer gets a mobile scanner unit and you scan each item as you go through the store and put it in your cart. This has multiple advantages: You only have to touch each item once, not three times. You always know the accurate total price – no more counting in your head. And the actual checkout process is just the payment (plus the occasional random spot check), so there's almost never any lines. All in all makes for a much quicker and more relaxed shopping experience.

Unfortunately I don't know any numbers re theft, but it's still running 5 years later. Of course being in a suburban area helps.