Summary: Its a cheap fan for an old cheap computer. It wont push a lot of air like a major brand fan, but it works good enough for an old second computer that needed a fan. Not silent but quiet enough.
Summary: I bought two of these to replace a couple old fans with failing barrings in my case. I hooked them up through molex, and at full blast they are extremely quite. Much quiter than the previous fans they replaced, and close to the same CFM.
Pros: Quite, Cheap, Have a Molex Connection, Discounted if ordering more than one.
Pros: They worked for a month or so. Quiet. Inexpensive
Cons: I had two of these mounted at the front of my case to bring air in. After a month in a vertically-mounted position, they started to make a loud "screech" sound. I tested each independently, and each made the same sound. Replaced them with better quality fans. Now I'm happy.