The Zerotherm Nirvana NV120 Premium is a great heatsink that can be had for as little as $42 after rebate, which is a great price for a solid performer. I just cannot get over how beautiful the finish is on the Nirvana, and that finish wraps the entire heatsink. The blue LEDs in the fan are a nice touch, and the fan controller allows the user to dial in exactly how much noise is acceptable. With a small margin of performance difference between high speed and low speed, I found setting the fan to just below half-way still kept it quieter than the stock cooler on my video card.
The biggest fault I could find with the Nirvana Premium were the imperfections on the base. These blemishes probably have a negative impact on the performance of the heatsink as they reduce the contact area. However, anyone with the time and skill could lap the heatsink to solve this problem, and anyone who is serious about performance probably would anyway. The only other issues were with the proprietary fan being harder to replace if something went wrong with it, and how loud the fan can get at full speed. There is a possibility of clearance issues if the CPU socket is high up on the motherboard and the user installs the Nirvana Premium with the airflow directed toward the back, but this would be the same as with any other tower heatsink based on a 120mm fan.
Overall I was extremely impressed with the Zerotherm Nirvana NV120 Premium. I would definitely recommend it for anyone looking for a 120mm tower heatsink. Please follow the forum link where I will be listing a few places this heatsink can be purchased.