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I'm curious on some numbers on how this performs compared to the commercial units the expensive food industry models and the new kick starter wave.

Something like this could be really neat since it is versatile and you could use it to heat/cool other things. Thinking about food the first time to mind would be temperature control for charcuterie and cheeses.

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People already do stuff like this with PID-controlled temp and humidity, both for curing meat and for barbecue. Auber Instruments makes controllers designed for it, and they're pretty cheap.

Exactly. This is really a general purpose temperature-controlling device (as opposed to the hyper-specific commercial hardware). I'm hoping to incorporate the same design into a smoker and refrigeration unit.

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