This is the slightly smaller brother of the Dark Rock Pro 4. It's a little simpler with only one fan and a single heat sink rather than two, and comes in at about $20 less. Still a very capable CPU cooler and looks pretty good to boot. It's also very, very quiet - quieter than Noctua coolers like the NH-D15, although the cooling isn't quite as good.
This price is about $7 below RRP, but the real deal here is that it's a) in stock and b) in stock somewhere with free shipping (with Prime obviously). As far as I can tell, only Scorptec and PCCG have this in stock locally, and both charge at least $14 for shipping.
Virtually inaudible Silent Wings 135mm PWM fan
Achieves only 21.4dB(A) at maximum fan speed
Six high-performance copper heat pipes
Airflow-optimized, wave-contoured cooling fins
Easily installable black installation kit can be mounted from above
Supports an additional 120mm fan; clips are included in scope of delivery