To add to Mikes posts, it is not a simple off/on action. If you watch the pilot lites, once your set temperature is reached your will see that it pulses the heat on and off. To maintain the correct temperature. At times, it will completely shut off the heat element to maintain the set temperature, this generally occurs if there is an additional heat source other than the element. That additional heat source can be the generator or direct sun light shining on the cabinet. Overall it is extremely accurate, and if you have a ham in the smoker that you want to smoke at 80°F you can leave it over night and not have to worry about the cabinet going any lower or higher; even with the changes in ambient temperatures.
I was on the BBQ Guru website today, and saw that anyone with a Bradley made after 2007 needs to call. I would suspect that it has to do with the change of power from the cabinet to the generator. That cord will not plug into the back of the Raptor; they may suggest you purchase the proper cord when you order.