So basically and to their credit, exactly as advertised.
I've got to say i started off with a really negative bias towards Noctua.. i found most of their fans over-rated in terms of performance, their prices inexcusable given the alternatives.
While i still feel this way in regard to (most of) their fans, i've come to view the iPPCs as an exception, a marked one. Have slowly replaced everything i had with them and no regrets. If anything, i wish they made a similar off shoot for the 92mm variety
Fast forward it a bit and for reasons i won't bore you with, i'm contacting their service on behalf of another and am blown away by the speed and quality of the response; a bit closer to the present and i need to replace my own cooling system, finally decide to go with a Noctua for a change.
Let me just say i sold my Thermalright the next day and haven't even the slightest inclination of switching or even trying anything else out; well, until an NH-D16s comes out
Still have my gripes (then again, no one's perfect), see fans above; but i can say they've proven -to me personally- that they can be reliable and that's a tall order alright. I respect that a lot.
Re-li-a-ble. The opposite of being in need of assistance and having someone asking you to "pleez say whats your problem"; again that is, 'cause you've already explained it.