Features:
The Dual Storm has many amazing features. The dual layer fan blades increase the airflow and air pressure which provides greatly increased cooling efficiency. To give you a little better understanding of how this works I'll quote from the CoolerMaster site:

The basic process of removing heat from the CPU uses a standard heatsink/fan combination with the fan providing air pressure and volume to cool the fins of the heatsink. Unfortunately, the design of the average hub fan limits the effective cooling area to the outermost part of the heatsink, creating a “blind spot” near the center – the hottest part of the heatsink. Dual Storm, with dual-layered fan blades, blows a cyclone of cool air using opposing rotational directions, reducing the blind spot at the center, improving cooling and performance. The torrent of pressurized air under dual-layered fans provides high tech efficiency in cooling the hottest CPU with a high density heatsink. By Cooler Master, the ultimate thermal solution.

Another great feature, for those people who will use this fan on their CPU, is that each fan has an independently operated motor. This means that if one motor should happen to fail, the other will continue to operate and still provide cooling to the CPU.

(Click to enlarge)

The Dual Storm also features a fan speed controller. This can be mounted in either a spare slot at the back of your computer or in a 3.5" drive bay at the front for easier accessibility. Since the Dual Storm is somewhat loud, this will allow you to tame the beast when not doing heavy load tasks.

Of course the most noticeable feature is definitely the looks. The Dual Storm seems to remind me of an alien turbine of sorts. There are "claws" that wrap around and point to the middle of the fan, and the center hub of the fan is covered in a gold coloured mirror finish. If you look closely in the pictures below you will see a surprise in the middle, thanks to this mirror finish .

 
(Dual Storm in all it's glory, click to enlarge)

Testing:
The first test was observing my overall CPU temperatures with the Dual Storm as opposed to my old fan. On average my temperatures are 2 to 3 degrees Celsius cooler than with the stock fan, which is a considerable drop in temperature considering it was just a fan upgrade and not the entire heatsink.
I also gave the included fan speed controller a test to see how much it varied the speeds. The full speed was 3245RPM, and the lowest speed was 1607RPM.

(Click to enlarge)

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