H-E-double hockey sticks no. They are completely wasted on 'normal' users. If the user doesn't run them at least 2000rpm regularly, they're just wasting money.
They don't perform any better than the NF-F12, NF-A14, and NF-A12x25 at their respective max speeds - that's why I said AT LEAST 2000rpm.
Just changing one fan? That won't do anything.
I played around with 'em for a little over a year, which is pretty much how long I could tolerate them...
Also, there's other downside to these fans: IF thermals exceed 70-80C[This value depends on the motherboard, I think.], your fan curve is IGNORED and the fans will run full bore at 3000rpm...
You can't just replace 1 fan either - ALL fans, including the cpu cooler.
TL;DR: If you don't...