Have used rigorously for 4 months.  Very happy with this purchase.  Pre-heats quickly, cooks evenly, which are the most important things for an oven!  Used meat thermometer for first time recently and it worked perfectly.  Only negatives would be that you cannot just use interior light for one oven, only one timer which really needs to be louder.  If away from room, you cannot hear it. And, the racks scrape the side tracks terribly.