I was excited by the idea of using a silent CPU cooler in an HTPC but in the end had to remove the NT-01E and install the unit that came with the CPU.
The first issue is that the installation instructions could be much better. There is no indication as to how tightly to secure the standoffs. If you tighten a standoff too much the rubbery washer that is sandwiched between the motherboard PCB and the standoff tear, causing the standoff to sit at a slight angle relative to the PCB. As a result, it is not possible to mount the heatsink squarely on the CPU - which is absolutely necessary for good heat transfer.
The second issue is that the heatsink may interfere with a PC slot. I used the NT-01E with a micro-ATX Gigabyte GA-MA785GM-US2H motherboard and found the that heatsink overhung the PCI-E x1 slot just enough to make it impossible to insert a half-height card.
As an aside, I was also using a SilverStone Grandia GD04 case. With a DVD reader installed there remained about 1-inch of clearance between the reader and the NT-01E, which made me wonder about how freely air could circulate through the heatlsink fins.
I was initially very keen on using a fanless CPU cooler. But, faced with the above problems, I decided to use a heatsink with a fan. The only regret that I have with this decision is that I have another moving part in the system. The speed of the CPU fan is regulated by the mobo, so fan noise is inaudible under normal HTPC operation. Unless the CPU is busy marking commercials in a TV recording, CPU use is light and does not require a high air flow rate for cooling. At a room temperature of 21 deg-C the CPU fan spins at about 1200 RPM.
Too bad. The NT-01E really looked like a nice product.