i actually like mine as well. never used any of the Zalman coolers, but i've heard good comments on them. Mine's the GigaByte 3D Cooler Pro. mine isn't all copper, but still cools rather well and has an adjustable fan speed. uses 4 heatpipes that go up through the four corners of the heatsink, and 2 central fans blow air directly out the sides to effectively cool the heatpipes. I used to have my P4 2.4 OC'd to 3.0 (which i plan on attempting again. reason i had to put it back to normal is cause this ram doesn't like to be overclocked as much as my old RAM did. old 512MB DDR400 was running at 415, and this 1GB goes psycho at that speed) and the temps didn't go up at all from using the stock fan at stock speed. i'll admit it doesn't really DROP the temperature much, but it can sure hold it's temperature. on a not too bad note it weights like 430 grams or somethin. they have an all coper one that weighs like 700+ i think. kinda nuts, but i love them.
here's the link to their list of products
http://www.giga-byte.us/Peripherals/Products/Products_NewProduct_List.htm