> We've had that in France for years, and noone uses that as far as I can tell.

Which part of France are you in? Where I am, Paris suburbs, I see it used all the time in Carrefour.

There is a learning curve, which I think inhibits wider usage. I used it a couple of times, and every time I forgot to scan stuff, or forgot whether I scanned stuff, and had to go over the last scans to check.