Review on USB Radiator Fans - Essential Cooling Accessories for Valve Index VR Headset, Enhancing Gaming Experience and Prolonging Device Lifespan by Jeff Aulia

Fits nicely in the trunk, is quiet and blows out pretty hot air. Definitely worth buying, no doubt does exactly what makes it more expensive. The button is loose and can vibrate a bit when it's on - this is easily fixed by sticking a piece of paper or tape in there. Since installing this fan, my index has stopped heating completely. Seriously, no more sweaty issues or dropped frames. It removes the heat completely. I would say such a fan is 100% necessary, it's weird that a thousand dollar headset didn't come with it at all. I'll update my review if anything goes wrong, but so far it's been a great update.