To start things off, the 6Cu looks the same as the previous test unit, the Volcano 5. No design awards to be won here, it is one plain looking heatsink. The addition of the higher speed fan and the copper base does give a bigger 'umph' to the package. The fan itself is incredibly loud, if anyone tells you otherwise they have some serious hearing problems. It is on par with the loud black label Deltas.
Here is the major difference between the V5 and V6Cu. There is a copper circle on the bottom of the 6Cu unit, measuring a little over an inch and a half in diameter. The 6Cu/+ both support up to an AMD ATHLON 1.5GHz+and INTEL PIII 1.13GHz & TUALATIN up to 2.0GHz. The 6Cu unit is a bit heavier than the Volcano 5, but that shouldn't cause a problem on anyone's motherboard.
There are still 22 fins on the unit, with the outter most fins being ribbed. The fan still rests on top of a black metal piece. From the review of the Volcano 5, it seemed that this black piece did a nice job of keeping the airflow in one direction only. No air was escaping at all from any spot except the two sides.
As usual, I scraped away the black thermal pad with my VISA card. This actually works a lot better than a razor, you probably won't be cutting the copper too hard with this method. The last thing you want are some nasty scratches on your nice smooth copper base.