A must have if you have an in-line fan.
582602
Gives me great control of my in line fan to keep down noise and/or costs.
431477
This fan fit and worked like a charm. Whisper quiet now. This is actually the second time I replace the cooling fan on this laptop, I don't think these are made to last but only a few years, but then again I leave my laptop on pretty much 24/7. Installing it was... not easy. If you don't have the right tools and you don't have a lot of patience I would probably NOT recommend you try replacing this yourself. But if you have the skill, and the right guide or tutorial then yeah, this is a great part.
611606
Nice quality for the price. Expected less and it really surprised me the nice finishings and details, close to an authentic one but way cheaper. Very good option for the regular fan. A must have.
1711619
We love these fans. We can  3 others and use these all the time. I like how this particular style allows you to go from full usb to micro. The benefit of this is we can also plug it into a portable battery and use that to power it rather than always using the cell phone. A must have if you want to keep air moving, keep cool or just simply keep yourself a little more comfortable.
449688
Having bought a new case, i got a whole bunch of fans to go with it.  despite them being able to be used with out a fan control, i decided to get one, because i realized that the fans can be quite loud. so i got this.
definitely worth the $20 or so i paid for it. it installed like a breeze (note that it'll fit into a slot that a normal sized CD/DVD drive would fit into).  It can control up to 5 fans and it'll vary speed and in the case of my fans brightness of the LEDs.
When the fans (5 of them) are full blast, it can get pretty loud. i usually don't turn them up to full blast unless doing something strenuous to my computer like playing games doing some data analysis of huge data sets.
overall good and worth the investment for a more customized computer. probably not very useful if you have 1 fan.
858933
If you do not have space to instal one with a fan. This is your best alternative. It helps cools off the motor a lot faster that without this.
4622519
Easy to install and add to your computer for added air flow. Just make sure you have that needed rear space to install it as new motherboards have fewer and fewer add on slots. Easy 4 pin connector too in case you only have one 3 pin fan plug. If so, look for a spliter as sold on Amazon and that really is a great add on and cheap too.
1944265
The old fan wore out, and this has me using the computer again.  It works great, and the installation was straightforward.  Just look for an appropriate video on youtube, and take it step by step, and it is all done in a few minutes.
3142222
This gives you the control over how your fans operate which is quite handy with its touch screen and temp read outs. Can set it to auto if you want also.
3998337
They worked great for fixing my ceiling fan problem. Have 4 fans with one or two bulbs not working. The LED bulb cuts down power on the system and the lights work again. Saved hundreds with this hack.
3791466
It is an excellent addition to the fan set. I highly recommend to buy this in conjunction with any of the fans. I wonder why it does not come standard.
At any rate, very satisfied and it is working fine for my application. Will surely acquire two or more units in the near future.
3930921
Needed a second fan to push air through the radiator, and assist the pre-existing pull-fans.. These fans were uber easy to install. Spin quietly. Move just the right amount of air, and don't over-tax the electrical system.. Ran them through these relays: GENSSI Car 30A 12V SPST Micro Relay Kit For Electric Fan Fuel Pump Light Horn 4Pin (10 Pack) .. Together it's a match made in auto-heaven. Good buy all-around.
1541181
I want to say that I love these fans, very quiet on low, audible on high but not loud at all.  One bonus of these is it has a 3pin adapter on it so you can plug it right into your mother board if it can reach.  If it can't reach it comes with a 3pin to molex adapter so you can use that also.  Not needing the adapter saved me on some cables in my case though, I'd recommend using it without the adapter if you can.
3046453
Great product if you have the proper fans. People complaining about the badness of these are trying to use the wrong types of fans. A typical fan has two screw sections, a long tube for a long screw/backwards short screw or an open corner to where these fit nicely. Rubber has no noise to it besides the general fan circulating.
4744684
this was easy to install. Works great. I love not having to listen to the fan going all day because someone forgot to turn it off!
827559
Perfect fix for my rear AC fan.  Saved my $500 as this is what a mechanic wanted to change the fan that was not faulty.
Note that you don't have to undo the screws.  There is a plastic clip that has to be pressed in order to twist and unlock the unit to get it out.
2580301
I hooked this fan up to my Nissan Frontier that originally never had a condenser fan.  Was worth every penny.  This things make a huge difference in how well the liquid refridgerant is cooled.  I had to go buy a relay to plug into the fuse box because my truck was prewired for this but once I did it kicks right on.  The only downfall is that the slide for the plug is made of cheap plastic so it broke as soon as I plugged it in.  It was my fault but I would hope that stronger plastic would be used.  A small strip of tape fixed that no problem.  I does not come with any nuts to secure the fan due to different vehciles have different size bolts but honestly... was pretty easy to install and use.  Some vehicles have these fans and they are loud... this fan is pretty much silent... I don't have a loud engine but I cant hear it at all.

I would buy again.