I purchased two of these about a year and several months ago and naturally they stopped working three months after the one year warranty. Before that, they were reasonably useful for keeping the air circulating in my office cubicle but I'm afraid they would have not been useful for much more than that. Even on the highest setting, I could not really feel the air blowing from them unless I was right on top of them. If it was in a larger room or some other setting, I fear they would be completely useless. For my needs, they did their part and the price was right, so I can't really complain. However, I will not be buying any more and I cannot really recommend this product to anyone else.