Old post but still watching.
Speaking as someone who’s worked in both retail and retail tech for the last 15 years or so, what I see you want as as POS is:
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definitely touchscreen.
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stable.
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reasonably priced.
Given that you can buy a brand new iPad for $379 or so and given how stable it is as a platform, how could any other option compete except for outlying use cases which Shopify isn’t designed for.