Cons: Worked great for about the first month. Now it's loud and will only get up to 1750 rpm, rated at 4200 rpm. I can also tell through my hardware monitor software my cpu is running at least 20 degrees hotter. I am so disappointed in this product. I would never recommend it. I am actually going to spend some more money on a better different brand at this point.
Cons: but it isn't. I ordered one and it arrive with the plastic piece that holds the fan in place broken. I called Newegg and they graciously shipped a replacement out the next day. When I got the replacement, that one was broken as well, but this time it was the actual fan that was cracked... Luckily, out of the two broken heatsink/fans I was able to build one good one.
Cons: Bought this for some low end pcs for my sister and mother in law. After two weeks my mothers fan stopped turning, so i cleaned it up and it came back to life for a few days then died completely. Two weeks later my sisters locked up so bad i couldnt even turn it by hand.