I don't own a Duraflame heater, but after seeing them advertised repeatedly on QVC, I looked one over to see what the hype was all about. After looking at the heater, and reading the booklet with it, I came to the conclusion that it was all sales hype to buy a cute heater in your choice of colors. I read nothing at all in the booklet that convinced me the heater would save money on heating expenses.
Both my brother and my mother heat their homes with wood and coal, so they are used to a hot, dry heat. Brother bought 2 of the Amish infrared heaters that were introduced several years ago, and lets our Mother use one in her living room. They both love the heaters, think they perform as advertised, and are cost efficient. With wood and coal, the fire usually dies down by around 4 a.m., so the house begins to cool off, and the inside temperature begins to drop. When Mom gets up in the morning, her living room temperature is 72, and her electric bill was only $5.00 more; brother's electric bill was $8.00 more, due to the heater being used as the sole heat source in one of the older, and unremodeled rooms in his house. While the cost of these infrared heaters are much more than a Duraflame, they do seem to be a wise investment for safe, supplemental heat. Because of Mom and brothers experience, another SIL bought a knock-off of these infrared heaters at a bargain outlet. After one month, she found herself taking that heater back for a refund, because their electric bill went up $20.00, and did not provide the heat expected.
If I were in the market for a supplemental heat source, I would choose one of the Amish infrared heaters and spend $350 to get something that works, and performs as advertised.