They look...but they don't perform as well in a Core 2 Duo setup. The Thermaltake coolers will cool the NB as well as the Vregs & memory, which are important for high speeds and Core 2 Duos. The Zalmans will cool the processor, but nothing else.
And think again if you think I am a fanboy of Thermaltake. I own the Zalman 9500LED. It provides decent cooling, but now my memory is hotter than with a Zalman 7700-alcu.