I bought this heater months ago thinking that I would try it in between the seasons, but the winter season in GA was cut short and this unit stayed in box unopened, unused until this week. User friendliness gets 5 stars. Just removing the heater from the box, rip all the plastics off and plug it in. I set it in the 17' x 20' living room where it leads to open kitchen, hall way and the stair case. I wanted a heater I could use before I officially turn on the centralized heater which blasts through the entire house. This heater does the job. There is no annoying sound, no burning odor at the first time plugging it in as some previous posts suggested, I keep it on lower heat and never leave it on unattended ... meaning that the unit is ON when I am in the room where I could see it. I have 4 cats and I don't take any chance with any appliances whatsoever. Would my cats ever decide to jump or lean on it to cause it to tip and fall on the floor? Maybe. As far as I know, the unit has auto timer but not auto-shut off feature when and if it tips over. If you are looking for a heater with such feature to shut-off automatically as some other units being sold at much higher price, obviously this one is not for you. It all depends on what you are looking for in terms of buying a space heater. My budget to be spent for a heater was no more than $60 and I am glad I bought this Lasko model 5160. As soon as you turn it on, it starts disbursing warm air out but the enclosure seems to stay cool to touch. That is the most important feature for me when it comes to space heater that the unit itself doesn't get HOT.