Summary: This is very big. Like, I'm not able to close the side panel of my PC with this installed because I have a fan on the panel as well. That aside, I love it. This is really powerful and you can feel how cool it is without the fan by touching the metal. Very high quality. Just be warned about the size if you have a smaller tower and you want to close it completely.
Summary: Works well. No overheating on an overclocked CPU. Like the pots to adjust fan speed. Fairly quiet, if you keep the fans as low as they need to be. It's a big unit, so make sure you have the space but the installation instructions were easy, and they provided a bunch of adapters to fit a variety of processors. I use it on an i7-920 and temperatures stay reasonably low, even when approaching 4 GHz.
Summary: Keeps my i5-3570k nice and cool. It's a bit large and just barely fits in a mid-tower so you'll have to figure out a good layout for the rest of your components on the mother board, and make sure cords are tied away from the fan blades.
Summary: Adjustable fan speeds via control knobs give this heatsink/cooler a nice configurable balance between ultimate cooling and ultimate performance. My setup is running an i7-2600k @ 4.4ghz 24/7 with the fan settings set to unnoticeable noise levels. In Intelburntest, temps top around at 69 degrees Celsius with ambient room temperature at 70 degrees Fahrenheit.