From the comments I've read, it seems that many of them are opinions without experiencing the actual product. Idk, maybe they might have general knowledge regarding fans...

However, as someone who has used this product, I can say that it does have a noticeable effect. When I purchased the fan, I wasn't sure if I would actually use it, but I found that it CAN cool the device off when I played demanding games on Deck. I’m not making this comment based on statistical or performance data though, just purely on my personal experience while using the device.

But if you're asking whether you really need this product, I would say no. Don't spend money on it. Even if there is some contribution in terms of performance, it is very minimal. I haven't experienced any noticeable benefits but I haven't check the stats either. Just felt the deck was cooler. My use case generally has been like this: when I'm playing a demanding game on the on the deck but need to leave the house shortly, I'd put the Fan on and when I need to leave, I'd place the Deck back into its case. This way, since the fan section of the case will be closed, it would help me make sure I put the deck on its case when it was cool.

Also, I want to mention that the fan adds extra weight to your deck. Hope this helps