The transom window circulator is well worth the price. I have a smaller Vornado fan that I purchased a few years back. I plan on purchasing the stand up fan that's energy smart.
I ordered extra foam seals just in case I needed to change windows. My windows are not the ones you would see on a you tube page, their newer. The good thing about this product is it fits perfectly in the window with out compromising the screen in the window. I rated it a 4 for two reasons. The cfm for this unit should be higher. Having the fan on  number four is okay but I would prefer a stronger breeze. If Vornado decides to upgrade this unit I hope its a higher cfm. Cleaning the air circulator can be challenging. It would be nice to incorporate an access to the inside of the unit for easy cleaning. Unfortunately with this unit there's no easy way to clean it. You have to be super careful how you clean it. I'm satisfied with the purchase.