It is a pretty good device. I've had mine for about 9 years now so far it works great. I used to put in my own work station during winter if I think that the office is too cold. Now that I am not working and if I think the area I'm at is chilly I will turn it on. I will also turn it on if the bathroom is slightly chilly in winter when I'm bathing my boys. If it is turned on and if my boys tip it over it will shut off. Performance So far so good Ease of Use Pretty straight forward Durability So far I've moved twice with it and it has gone every where with me so far still works Safety Automatically shuts off when is tipped over.