We noticed that a couple of dishes seem to cook more well done at the same temps as our old oven did. We are not sure what's going on but we think the old oven was not really maintaining an accurate temperature.  It was taking twice as long to preheat so we think some gas vents were clogged. We stopped using it the minute we decided there was an issue.   The new oven preheats much faster. We like the option where it turns itself off once the timer hits zero.