Well, I work in retail exactly in this field for chain of roughly 100 small grocery stores mostly in rural villages in central/eastern Europe. We do have couple larger stores, where larger doesn't mean big in global scale, for us it means they need 2 cash registers most of the day.
We do have few stores equipped with self check out registers too. There are 3 types for us and all of them with different pros and cons.
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Bigger stores. We have 2 stores where we installed SCOs as an addition to regular check outs. It works great if you have just a couple items and don't want to wait for those 3 people standing in line. I prefer to use them with most of my shopping there, because they are often empty/instantly available unlike regular check outs.
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We have 3 small village stores with one regular check out that we expanded with one SCO. These shops are open 24/7, while cashiers are there for roughly 8 hours a day and the rest is full automatic. You get in through ID, pick your stuff, check out and leave. It is great idea, but prety novel in this region and people are not used to it yet. Remember we're talking about villages with less than 1000 people.
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We also have 2 completely self check out stores. Meaning there's no live personnel tobinteract with, only one person to go in, refill shelves and leavd. There's only one SCO and it also works 24/7 as number 2. This is in the smallest villages, with under 500 people and it's pretty successful so far. People are happy they have place to shop locally, because if it wasn't for this they'd be left without shop whatsoever.
Just my 2 cents. Also bear in mind this is Europe, where people are definitely not used to take long drives very often. Especially not because your everyday shopping needs. Be happy to answer if you had some questions.