Testing:
Testing system:
CPU: Intel Core 2 Quad Q6600 Quad-Core, 2.40 GHz, 1066 MHz FSB, 8MB L2 Cache, 65nm
Motherboard: ASUS P5B-PLUS
Memory: 2 GB dual channel of OCZ PC2 6400 (2 X 1 GB)
HDD: 2 X Seagate Barracuda (ST3250410AS) 7200 250GB SATA2, 1 X Seagate Barracuda (ST3320620AS) 7200 320GB SATA2, 1 X Seagate Barracuda (ST3500630AS) 7200 500GB SATA2
Video: ASUS EN8500GT Silent PCI-E
Power Supply: Silverstone SST-ST60F 600 Watts
OS: Microsoft Windows XP Professional SP2

Temperatures:
Idle: Average around 24C
Load: Average around 40C
*keep in mind that temperatures will vary depending on the internal setup of your case

Conclusion:
Putting aside the installation issues I had on my AMD system, the GlacialTech coolers performed great for their size and price. I'm glad to see that the silent version is truly a silent cooler unlike many other "silent" products being sold on the market these days. If you're looking for a CPU cooler upgrade but don't want to shell out a pile of money, then the Igloo 5710 series is something to consider looking into. My only complaint is the universal mounting system - it wouldn't hurt for GlacialTech to revisit this design and perhaps improve it a little.

Pros:
Both performed great
Two models available
Silent model actually was silent! (unlike many other products on the market that are falsely called 'silent')
Wasn't an extremely bulky sized cooler
Socket 775 installation now uses the clip-in method instead of having to screw it into the backplate

Cons:
I'd like to see a better universal socket mounting system, I had some installation problems on one system