I've had this for about a month and I think it makes a huge difference. I sometimes have my steam deck running most of the day on Beasts of Bermuda and normally the CPU and GPU run at around 80 degrees with lowered graphics, but if I run the fan at high speed for a few minutes and then switch it to the lower fan speed it can keep the temps as low as 65-70. I like how it doesn't need to syphon off the steam deck's power and I can have it plugged in separate if needed, but the battery on it lasts pretty long. I think I had it going for about 5 hours on the lowest fan speed before it died, keeping the temp optimum. I have the cheapest steam deck, I'm not sure if the more expensive ones have better cooling or not but I'm happy with how this fan works.