We have those and they are slow. I wonder when they’ll put them in the drive through.
[EDIT] My experience is muddling through the process once the first time I saw one just to see what it was like, but it definitely took several times as long as just walking up and ordering (and all I ordered was a coffee), and watching my wife try to use one on a family trip, spend about ~2x as long as it would have taken to just order at the counter, curse at it, give up, walk over and order at the counter.