It seems that ThermoSonic has actually split into to different companies. But fear not as the friendly folks over at PC PowerZone try to make sense of all the confusion. Oh, and while they're at it, they also just happened to have a review of the ThermoEngine Arkua 6228 Copper Core HSF. here's a snip:
"Upon removal of the fan, we see the core doesn't extend up to the top of the heatsink, but is cut into it. This makes the copper core relatively small so we'll see later if it cuts it or not in the burn-in tests."