I bought two of these for my NAS and I couldn’t be happier. I stacked 3 HDD drives in each and there is a small (but important) gap between each drive for air circulation provided by the fan. I also was pleasantly surprised how silent the fans are. The loudest part of my NAS is the spinning drives themselves. The fan also seems pretty replaceable should it ever fail. The only downside was the MOLEX power cable of the fan. I would have preferred a 4pin so the motherboard could control fan speed. At the same time, 100% fan speed is probably for the best anyways. The filter is a nice touch too. There are much more expensive versions of this device that don’t come with a fan or filter.I highly recommend you use NAS rated drives with this even if you’re using it in a PC setting. NAS drives are much better with heat dissipation especially in close proximity to each other.

Installed this item in a RackChoice 2U chassis that had 2x5.25 bays free. It was a little annoying on the part of the chassis that this EverCool unit wouldn't cleanly slide through the front panel of the chassis (required installation through the front of the chassis to allow for the fan filter door to operate), but I'm not sure which device is to blame for that.I love how the filter is accessible and cleanable, no comment on the fan noise as I run all my case fans at full speed regardless and this machine is not in my living space.The three drives I have installed in this carrier run a bit warm under full load (mid to high 30s C when doing a parity check), but that's atypical usage and normally they're high 20s.Have been using this carrier for about a year now and the fan still works. Overall it's a good value.

Used this to fit 3 more 3.5 inch HDDs into my dinosaur of a case, a Corsair Carbide Series SPEC-02.The adapter fits perfectly into the 2x5.25" bay. The drives fit perfectly into the 3.5" bracket; there is no wiggle room. I had worried about tolerances, but this adapter is very well made.Contents of the box are exactly as pictured; it came with a bunch of screws in a couple of ziploc bags that I used to mount the drives. There is an additional 2.5" mounting bracket (also pictured) that I did not use, but can confirm that it would fit a 2.5" drive perfectly. Note that this is not a hot-swap adapter, and there is no clearance in the bracket for a DIY hot-swap tray solution. Replacing a drive will require unscrewing and will likely involve taking the whole thing out.The adapter maximally uses the available space. When used with three big 3.5" drives, there is very little space between the drives: this is just because 2x5.25" literally cannot admit more, and is not a fault of the adapter itself. The drives themselves are longer than the adapter and stick out the "back" into the case; it's very much like the demonstration image.The fan is nearly silent. There is palpable airflow, but it's not much; my relatively bulky drives almost totally block the fan. Still, the drives are relatively cool: at 7200 rpm and 7 W idle power, they read 40 C (ambient 24 C). The openable door is indeed very stiff, per the other reviews; this is not a problem for me; I just leave it closed.Note that the fan connector is Molex! My PSU comes with Molex connectors (labelled for "peripheral"); you may need an adapter. The fan only uses the 5V and ground, so you may be able to rig your own solution.In terms of mounting, note that there are five rows of holes in the 3.5" bracket. I used the bottom, middle, and top rows; the top 3.5" drive goes above the top of the bracket. Because of this, it is not possible to mount the drives "upside-down". Unclear when this would be necessary, but be careful if you have this unusual constraint.

I have been using this product for over a week now, and I find no problems with it at all. I am impressed actually, and that is not easy to do after 32 years in the IT field.I am this to hold one 3.5" and one 2.5" SSD cache drive in my Z800 workstation. It matches the look of the case almost perfectly, and I do not use up any of my eSATA internal drive trays. I used the 2.5"-to-3.5" steel adapter plate ( http://www.amazon.com/Drive-Adapter-Convert-Mounting-E71439-001/dp/B00A6SQMSA/ ) which came with my Intel SSD to mount into this unit. This allows me to use one of each drive size with lots of space between them for quiet, excellent quality, cooling.PROS:- Very well made, out of quality materials with intelligent design features.- This product comes with both a 3.5" and a 2.5" (not shown in images) finished drive mounts!- The device will hold three 3.5" or four 2.5" drives directly in front of the included 80mm cooling fan.- the drive mounts are mechanically isolated from the frame with synthetic rubber dampers, this makes your drives quieter, and protects them from vibrations, such as those produced from slamming drawers or the thud of a sub-woofer on your desk, thus protecting your drive and data investments.- The fan is mounted in a separate cowling with a removable dust filter, that you can clean without any tools; the filter material is reusable and washable.- The fan is a long-life ball-bearing low wattage fan that is almost silent. It provides enough airflow to make the drives cool to the touch, thus protecting your investment.- The unit blends very well with black or white (choose wisely; **see note at bottom) cases only.- This unit is quality enough for professional, government, or enterprise level use.- The design of this unit exceeds OEM specifications for case design.CONS:- none that I can find so far!CONCLUSION:I will most definitely buy, and recommend this unit.The quality is there, the value is there, and design and features are there.Good job EverCool.PRO TIPS:1 - **Note: If you have a custom case, and you wish a colour match, choose the dark or light colour that more closely matches your finish paint, then have someone refinish the removable face plate with model paint, or Krylon ( http://www.amazon.com/b/ref=sr_1_1_acs_h_1i_2595039011&node=2595039011?ie=UTF8&qid=undefined&sr=8-1-acs ) plastic paint. You can find many tutorials online to how to refinish plastic to match something. Automotive, hobbyist, and modelling sites all have step-by-step instructions how to do this.2 - If you have a low-profile media case, with a double-height front drive-bay, use this EverCool unit to provide effective protection for a small RAID setup in your media server. Many media cases do not have the active cooling capabilities that a RAID array requires.3- To get a completely silent fan in your media server, it is possible to install a fan controller, or merely use fan resistors! ( http://www.amazon.com/s/ref=nb_sb_noss_1?url=search-alias%3Daps&field-keywords=Fan+Resistor ).Connect a fan resistor in-line with the fan to make the fan perfectly silent, even if you stick your ear right up to the front of the unit; for those very picky audiophiles!