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.
Summary: I ordered the narrow case front fans twice and both times got the thicker body fans.. They work fine.. and had to modify the mount.. But work fine. Would have been better to get the right order either time though!
Summary: Very quiet and pretty cheap, but I would avoid if you plan to use anything other than the molex connectors for power.
Pros: I bought several of these fans at once, so I got them pretty cheap. They're very quiet which is the main reason I bought them. They also move an adequate amount of air. Nothing that drastically lowered case temps but it makes a difference none the less.
Cons: Right off the bat one of the fans three pin headers didn't work so I was not able to connect it to my mobo which was my original intent. Whatever no big deal I just moved it elsewhere in my case and used the molex connector. About a month later I have another fan that the three pin connector stops working on. I hope this is isn't a continued trend.
Summary: These were a nice addition to my case to supplement my much louder 100cfm fans.
Pros: I purchased two of these fans to supplement 100cfm fans in my case. They are virtually silent except for when I first installed one of the fans it was producing a light clicking noise. This stopped after a few hours. I assume this was a bit of plastic hitting the fins from the plastic molding process.
Cons: Cheaply built. The fans themselves feel somewhat fimsy, but what do you expect for ~$5 a fan for 2 of them.