Pros: Quiet, Good Airflow, PWM
The XLP is one of the quietest fans I have ever tested. It quiet up until 70-80% speed. This makes it great for HTPCs where silence is a must. The seven blades are in a traditional design, and very sturdy. The attached cable uses excellent quality sleeving.
I think these fans would do well as a case or general cooling fan, but they should also work great as heatsink fans due to their high static pressure.
The fan mounting system uses four rubber tubes that are pulled through the fan and the case. These help reduce vibrations and make for easy mounting. Traditional screws may be used, but are not included.
I recommend the NB-BlackSilentFan XLP to anyone who needs a good fan, but doesn't want to break the bank.