Icronic has just posted a review of not one, but two heatsinks for your viewing pleasure. Head on over and see what they had to say about the Arxtech ACC8080 13VHZ and ACC8080 15VHZ Heatsinks. here's a snip:

"Now these were the goofiest results I've seen to date. I must have added these numbers up 10 times. What these graphs show is that the two heatsinks cooled faster in an overclocked configuration. I would have expected that the default setting would have cooled faster. Nevertheless these times are some of the best I've seen in my tests. I don't have a explanation for why the overclocked heatsinks cooled faster than the default configuration. Everything was backward to what I predicted. I guess that goes to show you that numbers don't mean everything to predicted results all the time."