Since my MES hasn't been coming up to temp I decided to call Masterbuilt. They got me to check the controller first, comparing to an oven thermometer. It was accurate. I set it at 275 and it was up to 240 within an hour but they said it should have been to 275 in an hour so they are sending me a new controller. They also told me that if this doesn't fix the problem they will send me a new smoker box and that it would be covered under warranty. How can anyone complain about that, other than having to do it in the first place, and things like this happen with stuff like electric smokers. Everybody is really nice too.