We purchased this heater to heat our un-insulated back porch so that pipes and parts on our dishwasher didn't freeze. We have had no complaints with it, and it functions exactly as we'd hoped. Performance The heater is quiet, and small, so it stays mostly unnoticed. It keeps the room as warm as we'd like it to be. For being so small, we are impressed with how well it works. Ease of Use Completely idiot proof. It's easy to set the temperature, and hard to confuse instructions. Durability It's really lightweight, which surprised us. It feels flimsy, but we have had no problems with durability. Design Not the sleekest model of space heater by far, but it's certainly not unattractive either. i would have preferred something more modern looking, but the price for this was too good to beat. Safety Has several built in safety mechanisms which we prefer.