I'm currently using a TT volcano 9. I hate it, and am going to be replacing it soon. The fan is very loud for one thing (even running at fairly low rpms, less than 3000). It includes a "smart function" in which you can attatch a sensor onto the bottom of the CPU and the fan will adjust it's speed accordingly. This works very well. Too well. Every time you go to do ANYTHING, the fan whirrs up, and when you close whatever you were doing, it whirrs back down. It's like a sound level roller coster ride. Of course, this makes perfect sense -- it's doing exactly what it was designed to do -- but believe me, it becomes VERY obnoxious after a week or two of usage. Last but not least, the heatsink really doesn't dissipate heat all that well. Only the base is copper, most of the heatsink is aluminum, and the fins are thick and few instead of thin and many, drastically reducing surface area. I'm running a palamino 1800+. My temps are usually at around 51 C under load, and that's WITHOUT ANY OVERCLOCK. I'm using arctic silver, I have it mounted very well (I've mounted many socket A chips) and the thing is in my basment, so the ambient temp hovers at around 20 C. Oh yea, and I have excellet case cooling -- about 4 fans running at 1000 rpm each, well placed (two in two out). I've tried everything to get this heatsink to work well, and I've finally come to a conclusion: It's a piece of s***.
Ah well, didn't mean for this post to turn into a rant. If you want a thermal take fan, go with the volcano 7+ or 11, or some other all copper solution. It's worth it, believe me.