Poor quality.
Developed a rattle after 2 months of use, and lower speeds stopped working. Also, plastic is cheap and discolored quickly. It does move a ton of air on high, and being able to close your window without removing the fan is very smart design. I did buy another from that big orange home improvement box store that has held up much better and has not discolored.was less expensive there too (although it was a year later when I bought it there).