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If the modules work as claimed, then $360 a pop is fairly cheap. Real world PLC units capable of extensible digital and analog I/O, networked, usually cost anywhere from $1000 - $10,000 per unit.

These aren't little gateways to CNC machines built-in interfaces (although they can be), they're controllers and automation systems for factories and production lines.

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For most PLC customers this is a no-go. They aren't in the market to save money on hardware. They save money by reducing downtime and eliminating failures. Without certifications for industrial control protocols (which take years and lots of engineering time to get passed), these will only be useful for those who don't really need a PLC.

I don't think that most customers will use these to replace their PLC. There's just too much at stake. These are more likely to be used as 'glue logic' between the PLC and unusual devices that need custom software or only have PC-based interfaces.

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