I used to work right near a McDonalds in Los Angeles that has had two of these in addition to cashiers for a few years.<p>Here is what I've noticed:<p>- All other things being equal and given the option, it seems that most people went to the human cashier. I can't ever remember seeing a person using one of these if there was no line at a person.<p>- During peak traffic times (lunch hour, as this McDonalds was near a bunch of business parks) they often needed an employee manning the kiosks to answer questions and help customers who got stuck. In this case, it was one employee for two terminals, but it could probably have been a 1:4 or 1:6 ratio no problem.<p>- Kind of unsurprisingly, people you would assume were not good with technology (older patrons) seemed to struggle more and take longer to order and get stuck more.<p>- There was a little bit of a learning curve to be able to confidently use on quickly, but even once I had gotten the hang of it, going to a cashier was always faster. Having a friendly, categorized, nested UI is just slower than what the cashiers have. Also, the terminal touch screen wasn't super responsive.<p>This all leads me to believe that this really isn't that big of an issue at this point. I expect to see a hybrid style approach like we do we self-checkout at grocery stores, where you have the option to do it yourself, but it's not the only option.<p>No matter how simple they make these to use, it's still a new "thing" to learn. Frequent McDonalds customers may opt for the terminal, but infrequent customers aren't going to want to take the time to learn how to use these, especially when they are in a rush or have other pressing issues (imagine a one parent 3 screaming children type scenario).