I'm one of those old fogeys who used to have attachments on their Game Boys to extend their battery life and make it possible to play in darkness (yep, that old LCD on the OG Game Boy did not have a backlight!). They always felt clunky and were prone to falling off if you looked at them funny, even if you used glue and double-sided tape. So I have always been wary of 3rd party addons to electronics, even if they were rigorously tested by the OEM and verified to work and fit perfectly (e.g. verified by Apple or whatever the iPhone accessory cert was). So imagine my surprise when I mounted this puppy, it did exactly what it said on the tin. This is perfect if you want your Deck to be cool to the touch even when the default fan settings leave it rather warm, and it could be the difference between a hardware freeze and a Deck that is juuuust barely able to run that taxing game. It's going to feel a little bit loose, but this is normal as Valve never designed the vents to have something sucking air out of them, and even though the fit isn't airtight, it's quite effective at pulling heat away from the Deck.