1st of all let me clear this.. The fan is not Cooler Master SickleFlow Blue 120 mm but Cooler Master SickleFlow X Blue 120 mm Cooler... which makes a little difference though... fear not the X version is better..
Next... taking about the fan..
Pros: $Cheap
$Stylish
$Good airflow
$Silent
Cons: @ No PWM (U cannot control the speeds!).. It has 3 pins..one for live, another neutral, and another ground.
@Very powerful LED..though not really a con ;-)
...

Firstly this fan has a cfm value of 90 not 69.6.The normal sickle flow has that value. The sickle flow x is the renamed 90cfm fan which is discontinued i guess. I was happy to see a 90cfm product when i was expecting a 70cfm fan.

I already own 2 coolermaster 120mm fans,they came with my CM case.I found a HUGE difference in the air flow. I placed both of them on a table and turned them on. The SickleFlow X was blowing sooo much more air than the other 120 mm CM fan.The difference was Huge.
...

coolermaster sickleflow is a very good 120mm fan. i am using it on the front of my CM elite 330 and well i am quite satisfied with it.
pros: 1. quite silent even though i connected it directly to psu and it runs at its fastest speed
2. comes with a 3to4 pin converter
3. quite sturdy and looks kinda cool
cons: i had some difficulty with the screws' fitting in the slots but thats not a very big issue

the shipping was fast; i got it in 2 days
overall a good buy

Compared to other CM products, this one had quite minimalistic packing,
notthing much to say here, this is one of best performing 120mm fan here in market.

Great air draw making it as best intake and exaust fan.
LED's looks nice when fan is used as Intake mode. they are not too bright.

the frame of the cooler is of high quality, you can feel the same when you are attaching it to case.

but for 600 bucks you get more than what other coolers deliver.
so go ahead and buy it

The first thing I noticed after installing the fan was that the blue LED's were soft and not very bright or harsh, which is good for me. The fan does the job effectively. My HD and GPU temps were brought down by a considerable amount immediately after use. It is quiet as well. I would recommend this to anyone who prefers soft LED's, some silence and opts for a reasonable cooling option within budget.
PROS:
Silent
Soft Lighting( One may or may not like)
Keeps Cool
Looks Nice
Cheap

CONS:
Ligh...

Excellent product. Although delivered by eKart Logistics, the packaging was written "Snapdeal" from the inside. I'll write to flipkart about thiss issue. Although the fan was delivered intact, sealed in its original cooler master packing.

1. The CFM value of fan is 90 CFM, not 69 CFM as stated by Flipkart. I suggest them to change the specifications. Cooling is awesome, you'll find instant results in a few cases. My PC's temperature drop was 3 to 4 degrees after installing this

2. Although ...

CFM is very good around 70 and blue led are not harsh on the eye, its a soft light.
Its cools my GTX 660 very well

good airflow, bigger than my expectation. blue led light looks charming at night. overall very good product at this price range.

I loved the fan it is so silent i have bought red color one now blue it is good go for it my spec i7 4th gen 24gb ram msi gtx 980 4gb 4g it. The fan perfect for gaming system

Light, almost entirely made of super light plastic. Lots of blades for air movement. Comes with 3 pin converter to Molex (4 pin). I bought 2 of these to add them to my case. I am very happy with these so far. They are very quiet and move plenty of air.