I just installed this- drilled holes into my window frame and everything! I am concerned that the plastic is flimsy- the fan is tilting out from the window because of its own weight. The high speed is hardly better than the box fan it's replacing if at all. The switch is plastic and doesn't seem like it will last too long. I am really concerned for those with small children who might buy this as I believe a tug on the cord could bring it crashing in on them. Also, if you don't have screens and are depending on this to block the window off when expanded, don't! Once it gets out to about 34", it has hole cutouts that allow air through when the unit is not expanded.