Pros: Low power consumption, well built, good airflow, low start up voltage, really long life and good on radiators and heatsinks.
Cons: Expensive, at full speed it is loud on radiators and very hard to get if you are in America
This fan gets better if you have a fan controller or a spare 3 pin header on your motherboard at low voltages this fan is basically silent (it beats Noctua and all its "science"(marketing BS) it apparently uses, well to me anyway), so you can enjoy quietness when doing light tasks then when you put your PC under load just ramp the fans up, you won't notice the noise when playing games. I can put 7 of these fans on one channel of my controller and that is including the start up current of this fans.
The downside to this fan is its cost OK $20 (£15) isn't much for one but do a push pull on a 360 radiator and it can get very expensive very quickly, so that is $120 (£90) for just SIX fans you could buy another 360 radiator with that kind of money or a good upgrade for your PC.
If you were to buy some cheap fans say around $5, that would be $30 on push pull that is a saving of $90 (£60). To be honest the difference in temperatures between Gentle Typhoons and other fans isn't that much.
So before you rush off and buy this fan to replace all your PC fans think to yourself,
Do I need to spend that much money on cooling?
If I need fans should I get cheaper ones?
Or should I Or should I upgrade my PC?
Yes the Gentle Typhoon is great but it is very expensive.