Pros: Looks good. Built like a tank. Look like a tank.
Cons: I purchased this heatsink because of the good reviews but I must of been one of the few that got a unit that did not perform. Compared to my Lucifer v2 which was 10c-15c cooler than the this Noctua (with 3 fans, mind you) that was running my overclocked 4.6mhz fx8320 to it's limit of 70c in a haf932 case. It's going back.
Summary: Coming from a Hyper 212 this is a superb cooling unit. Temps are down so far I may consider a prmanent overclock on this i7 4790k now. While the Hyper 212 is a good budget cooler, and will allow for a 4.5GHz overclock, seeing 85 C on a CPU is not something to feel confident about. I am interested in seeing how this puppy does @4.5GHz.
Pros: Finely machined baseplate sits FLAT in the CPU for excellent thermal conductivity. Baseplate machined to a mirror finish. Baseplate adds a little extra mass right on top of the CPU. Everything was well thought out in the design as well as in the instructions. Literally knocked 5 C (idle) to 6 C (full load) off of my i7 4790k (not overclocked) compared to my Hyper 212 (in the same exact case). This list could be extensive, but you get the idea.
Cons: NOT A CON because it is as advertised, however: I wonder if they put those unsightly fans on these units in order to keep such awesome performance out of the hands of the vein. I could think of no other viable reason.
Summary: Asus Crosshair IV formula, G Skill Ripjaws
Pros: This cooler is very silent and works so well. I honestly did't need it, as my cpu came with one, and I dont overclock, but I just wanted to try it out, and am very pleased. I will only recommend and purchase Noctua fans from now on. The fans can be moved up or down, if your ram interferes, which is a big plus.
Cons: Not a con for me, but I had to do some research when deciding on my motherboard/ram combo, to see if it would clear the fans.
Summary: Make sure you have enough room in your case cause this thing is huge, about the size of an adult head. Also make sure it will clear your RAM.
Pros: Extremely cool. Provided fans are really quiet, even on max. Currently have this cooling a 4790k @ 4.6 @ 1.19v and temps are ~27c idle and never exceed 70c on load/benchmarks. Phenomenal cooler. Definitely recommend.
Cons: My old cooler didn't work as well as this, so my room would heat up just from my computer. With this I now have to use a space heater instead.