I have used both and determined that by using a $30 oil filled radiator, it works out to be a much lower cost option.
Most oil radiators have three settings, low, medium and high, along with a thermostat. The low setting runs at 750 watts. With the thermostat at 3 (out of 1-6), it keeps a 12x12 bedroom at a toasty 72 degrees, when it is in the 20's outside. Best of all, it "clicks" on for around 30 minutes per hour. So I am actually using less wattage than this item. Plus, I have the portability of a unit on wheels, I can place it in middle of the room for better heat disbursement, the control of a thermostat. And finally, it's only $30