After checking the reviews on frostytech.com, I purchased both the Scythe Mine and the Xigmatek HDT-S1283 to replace the cpu coolers on two of my pc's.
Both coolers are very efficient and quiet tower coolers that weigh in at about 500g. There are better coolers like the Scythe Zipang but I wanted to avoid their excessive weight.
I like the Scythe Mine better. The build quality is excellent. It's very quiet. I believe placing the fan between two towers of fins is a better design. There are a couple of drawbacks. It's uses grooves on the edge of 12cm fans to hold them in place. My favourite 12cm fan, Nexus, have a closed flange around the corners and won't fit. You have to modify them to slide it in. I haven't tried this. I also found the pins that hold it to the S775 motherboard kept popping out. It's difficult to install with the motherboard insitu.
The Scythe isn't any better than the stock Intel cpu cooler. By the way, the stock Intel cooler for 45nm cpu's are all aluminum jobs - not the copper hybrid you see in the frostytech review. That version comes with the 65nm cpu's. But the Sycthe is much quieter and I've used a Zalman fanmate 2 to drop the rpms from around 1500 to 1300. It reduces the tone of the pink noise nicely and leaves the CPU at about 40C. Overall, I'm happy with it.
The Xigmatek HDT-S1283 is cheaper and I suspect it performs better than the Scythe. Installing it on a S939 motherboard was not easy as the pressure bar kept trying to twist as I pressed the clamping lever. There's also nothing to hold the airflow deflector so I bent it a bit to hold it in place. The rubber mounting nibs that hold the fan were a bit of a fiddle too. On the plus side, it's easy to mount any other 12cm fan on it.
It's a bit noiser but that's because I haven't been able to reduce the fan speed yet. It comes with a 4 pin fan connector. On my motherboard, there's a capacitor that block using this with the 3 pin cpu fan header. And the Zalman fanmate 2 only connects to 3 pin plugs. I should have replaced the fan with a Nexus before I mounted it as it's too difficult to change the fan with it mounted on the motherboard.
So between the two, I'd recommend the Scythe Mine unless you're trying to save a bit of cash and have a motherboard with a 4 pin cpu fan header.