Summary: Its possible that a front mounted case fan renders these type of coolers unnecessary. I would only recommend this for some with a case that does support a front fan and the hard drive is running uncomfortably hot. But if your drive never gets hotter then 40c in the middle of the summer then the truth is you really don't need this. Most hard drives are rated to about 60c.
Pros: Inexpensive and easy to install. I found it to be very quiet. I never heard it above my case fans.
Cons: The cooler simply didn't provide any tangible benefits. At best I saw a drop of 1c on the drive.
Summary: At about the 2 year, 10 month mark: fan started shrieking at start up (the sleeve bearing of death sound). This would last about 30 seconds and would cease by the time you go to your desktop. I finally removed them because of complaints from the girlfriend. I think 3 years exceeded my expectations for a sleeve bearing fan. Now that I have an ssd, I dont think I really need to cool my back-up hdd anyways.
Pros: It lasted just under 3 years. Metal housing is solid. Low cost way to hopefully prolong the life of your hdd.
Cons: It was never really a "quiet fan" but it wasn't too loud either.
Summary: Bottom line is the value of this item is good. The quality of the mount itself is quite nice, although the fans are not made from a strong enough plastic. If I were mindful of that I would have been more careful. Though the fan broke I can not say it was the manufacturer's fault. I have the devides mounted on the exterior of my Rosewill R5 case, where there is a honeycomb style opening for increased airflow for my drives.
Pros: Gets to job done, when used in a push/pull configuration they work very well. The mount itself is made from sturdy and very durable metal, won't bend easy and also looks nice.
Cons: The fans themselves are not made from a sturdy enough material. Had one fan break from an unknown cause a week after purchase.
Summary: Not many complaints about this fan other than it's one major flaw: an excruciatingly loud and eerie shreek/buzz coming from the fans upon resuming my machine from sleep. It is so bad I thought it was my HD failing when I first heard it! Detatching and re-attatching the cooler, or even restarting the machine, seems to fix the problem, but its far too annoying to be over-looked, especially when it happens 8/10 times I resume from sleep.
Pros: Keeps HD cool Cheap Dual Fans
Cons: Molex Loud Sleeve bearing Horrible noises from startup (see other thoughts)
Summary: Just buy some decent fans and these are great. Also, you may have trouble fitting them into an empty 3.5" bay so you may need to bend or cut some of the metal guides in the bay. Or just get adapters for a 5.25" bay and you'll be fine.
Pros: It keeps your hard drive cool, looks good, and is made with thicker metal than most brands. Other brands like the Masscool are flimsy compared to these.
Cons: The fans are terrible! They don't last very long before they start dying, and as they die, they get very very loud.
Summary: when i first installed. one of the fans was a little out of place and grinded against itself I had to bend it a little and it doesnt grind. but this fan is pretty loud going to be uninstalling.
Summary: Spend the extra few bucks and buy the vantech; still has a little of the cable problems but lines up way better
Pros: Cheap and reliable
Cons: The power wires on this unit are unfastened and if you do not find a way to truss them before intall they can come back and run in to the fans. The whole configuration doesn't line up well and puts unneeded pressure on the hard drive.