Meh - I was excited by JWO but it now looks like self-checkout will win because it works pretty well these days, and it handles all the corner cases including product sold by weight, large items, identical-looking items (common in grocery), etc.<p>With self-checkout, you don't need an account which is crucial for travelers. Self-checkout also supports cash for the unbanked.<p>I've tried SC in multiple countries, just hit the button for English, scan, scan, scan, weight, scan, scan, scan, checkout, touch my credit card, go.<p>Late night in Stockholm train station, I bought one bottle of fizzy water and checkout added 30 seconds or so.<p>Obviously, from place to place you sometimes get "rough edges" with mis-scans etc but JWO has its own problems.<p>I'm not even sure how much floor space JWO saves vs self-checkout.