I suspect it may be difficult to tune the controller for a pellet burner design. I would be curious to know how they accomplish smooth, even temperature control in any pellet burning design.
Does it seem like they leave the blower on constantly at a fixed speed, and use only the pellet feed to control the temperature, or do they also throttle the blower speed to adjust how rapidly the pellets burn?
I'm honestly tempted to buy one just to observe how it operates.
You could use a PLC or microcontroller to adjust the pellet auger AND the blower speed independently. But it would take some serious trial and error to figure out how to get what you want.
In a way, a pellet burner type smoker has an inherent problem like an all-electric that uses the main heater to also produce the smoke.
I think most of us agree that it is best to be able to control smoke production separately from cabinet temperature. So any system where the heating power is locked into the smoke generation seems less than ideal.
If you're just heating a large space, a pellet stove can achieve as good of temperature regulation as a gas furnace (for example).
But to maintain a tiny space (like a smoker) at a reasonably constant temperature may be more unforgiving and difficult. Further, since the smoke production is directly tied to the heating, you're back to a similar situation as with a single-heater all-electric like my MES40 was, right out of the box.
I think I will always end up preferring an electrically-heated smoker for ease of temperature control, but it also needs a separate (and separately-controllable) smoke generator so I can adjust smoke and temperature independently.
I'm still considering getting one of the PB5s to play with, and then modify. The adjustable shelves and size of the one I saw seemed just right for what I want in a smoker. I just don't think I would want the unit to be heated by the burning of pellets. I'd likely set it up with a 220V operated heating element.
Still, setting up a PLC and writing the program to control both the blower and the pellet feeder would be a fun challenge! But even if I achieved good temperature control, would I like how the smoke was? It seems unlikely.