I have had one of the Walmart under $20.00 ones go into melt down. Also had another one start cycling on and off and returned it. Others have mentioned oil filled which I thought might be a good idea but after reading this link I see they have their own issues.
OilI'm not saying anything bad about any of them but I would say that we are dealing with inexpensive products so you can only expect so much. I will use my remaining $18.00 heater but probably set it on my open oven door as someone on here suggested. If it melts down at least it wont be on the linoleum or carpet and will be LESS likely to start a fire. I may try an oil filled model too. I mean they do manufacture decent dog food and baby toys for us dont they?
Cheapo