This pellet grill is hands down the best purchase I’ve ever made. My oven sits unused inside the house as this is my main source of cooking now! The quality of materials is inline with pellet grills that cost 3x more. I’ve had absolutely no issues with the controller as it stays on temp or within +/-3deg depending on outside temperature. As long as you set the chimney topper at a 1/8” spacing, you will not have any issues with degree fluctuation.