@Bikey, don't confuse heat removal capacity with temperature control ability. I can rate a cooler to carry 300W, with the caveat that the temperature rise will be 50 degrees above ambient. That is not very helpful, is it? The same cooler can be rated at 100W with temperature rise of 20 degrees (say). Much more useful. Likely AC went overboard on the marketing of the freezer Pro.
In reality, it was just a little bit better than the stock cooler, though much, much quieter. At full load (using the Intel utility whatsisnameidontremember) there was a difference of just 5 degrees between the stock cooler and the Freezer Pro, except the former sounded like a dying pig and the latter was literally whisper quiet.
I assume the Extreme is a much bigger cooler and therefore much better at removing heat. AC has been known to be a low-flow, quiet cooler, not the Thermalright style of extreme cooling performance.