Temperature recalibration was done due to food getting burned. After -8F offset, temps from 325 to 375 are good now. But the error is still over 20 degrees too hot at 400 and above. To get 400 we must dial 378. For 425 we set it to 406, and 450 we set to 429. Also the preheat duration is too long, and cannot be adjusted. This causes overshoot to about 450 when set to bake 350. Additionally there slits on the sides of the oven bottom, leaving the flames exposed. Food will burn if placed on the bottom rack. There were some build quality issues too: racks binding in center positions, side metal not snapped together on bottom, chips on cook top and in corners of display. Wish we did not buy this.