As a long time owner of the original bradley and a "pid" in my opinion the digital and the smart smoker are the basic smoker with added gimmicks.To me they're not worth the extra money. All you get are lots of buttons to push, both the digital and the smarty have the same 500 watt oven heater as the original and neither has a built in pid.If close temp control is important and in some foods it is you'll need to add an outboard temp controller (pid). So IMHO neither the digital or the smart smoker are worth the extra cost.Others I'm sure will disagree.