I purchased this product because my Ender 3's stock fan became very noisy after a week or two of normal use. I installed this fan using the same power connectors as the standard fan and it worked fantastic! This is not just a replacement fan, it is an upgrade to the one that came with the Ender 3. The protrusions are much cleaner and the noise is more consistent (no random buzzing/howling). Pros: - Easy to install! (at least on the Ender 3 3D printer) - Quieter than the stock Ender 3 fan (although not quiet) - Can improve cooling of parts and protrusions! Cons: - The fan is a bit noisy. It's quieter than the one I originally had, but I've seen small fans like this run much quieter. Standing in a small room, it almost sounds like a small table fan or an air purifier running.