This is a premium fan, suitable for people who are too lazy to replace failed fans, or for use in places where it's difficult to get to the fan for replacement. Generally lasts longer than less expensive fans, even in the heat, but if you work out hours of service per dollar, you'll still be spending more on these.
I use them for things that may get more heat than the rest of the machine (like Nevermore) or things that are a bit of a pain to replace the fan on (like Nevermore). For simple swaps like StealthBurner, I use lower cost fans.