Summary: I bought this convection oven to save money/electricity and time. It does neither. I replaced a 35 year old oven that could get to 375 degrees in 7.5 minutes. Using the "Quick" Pre-heat function on this oven, the timer goes off - supposedly indicating that the temperature has reached 375 - in 6 minutes. Great, until you check the temperature and find that it's only reached 225 degrees. The manufacturer says this is correct.
Summary: "finally had a 25yr old Litton oven/microwave die and this was the only double oven that easily fit without carpentry. We didn't expect to notice any significant difference in baking quality, and have been stunned by the improvement. Results are more moist, and heat penetrates before browning becomes burning, making toothpick tests a thing of the past.