Have had my Bradley digital for going on 2 years now. Yes, the temperature reading is off significantly but I knew that before I bought it by reading here. I bought a good external thermometer that I trust and have had no problems since. In the beginning I had one issue with the with the bisquette burner but that was resolved with a simple phone call to Bradley. I have cooked brisket, pork shoulder, turkey and chicken with no issues since.
I have found that most temperature gauges on BBQ's, Grills and smokers are inaccurrate. I spent many hours reading here in these forums before I ever purchased my smoker and I am glad I did it. It made aware of the shortcomings and advantages of the smokers I was looking at. Please avail yourself of the FAQ's and specific forums here to learn about your device.