A friend of mine has used SumUp for 3 years or so & loves it - I used a World Pay counter terminal for ten years - very reliable, but extortionately expensive (never again).
If I decide to go back to retail, I will use SumUp or similar, the world has moved on, thank goodness!
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To get some perspective, back in the day Lloyds made me wait two years before graciously letting me rent a terminal