This product performed well for what I bought it for, cooling a homebuilt NVME flash drive. Before installing heatsinks, my drive ran up to 150 degrees Fahrenheit under heavy use. After installing some of them, the temperature dropped to 100 degrees, which is enough to feel warm. I have about 3 square inches of total coverage and can't expect better performance from a passive cooler of this size. I was also impressed with the quantity for the price. I have enough for several projects with comparable heat dissipation needs. I look forward to pairing these heatsinks with a couple of 25mm fans for my next project.