Finally fitted mine on the G0 6600 last night and the difference is quite pronounced between it and the stock cooler. At stock on the stock cooler the temps were 38/68.
I'm sitting at 3Ghz now and idle = 31, load = 51
I'm well disappointed though in how tricky it was to fit. In principle it seems easy and the installation instructions are clear, however the plastic lugs do not hold the cooler down well enough in my opinion and too often the lugs from the opposite side would "ping" up of their own accord whilst I was trying to fit it!
After about 20 mins of cursing the thing I finally got it to stay in place with all four lugs properly attached. I don't have a massive amount of confidence in that push pin design though. As a comparison the Zalman fitments for the 9500 were excellent, even though it required the tray to be removed.
Here's hoping the freezer 7 stays in place !!!