Temp swings are normal, and seem to become more narrow as your SI gets some seasoning on it. But it will always swing with the stock controller. I don't have an Auber, and get GREAT results with everything I've smoked! It truly does average out, and most things don't really require that level of precision (some folks might disagree). You might want to do several smokes and see how things come out. I've smoked practically everything, including cold smoking, and have no plans, or reason at this point to add an Auber.