Just like the random events that affect human history, I might have sprung for the CNPS-7000-Cu if the motherboard I had at the time the Zalman became available had not been incompatible because of "AGP-proximity-to-CPU".
But I HAVE been pleased with my heatpipe coolers -- first the ThermalTake PIPE101 and now the ThermalRight XP-120.
Here's something else. The Zalman and other HSF models have been the focus of ducting mods which actually improve HSF performance. The ThermalRight XP series may actually lend itself to a simpler design for the "Foam-Board Mod" (see thread in this forum), because of the orientation of the heat-sink fins. With the ducting mod for the Zalman, you have to remove the proprietary fan and fit a duct-nozzle in its place.
My gripe with the 7700 is its size and weight. 938 grams? NINE HUNDRED THIRTY EIGHT GRA-AMS??!!!
I can just see the review description of an installation procedure: "We then attached the motherboard and case to the heatsink."
Even so, from the numbers reported to me by a friend who lives a few miles from here, the 7700 does what Zalman says it does. I just prefer something lighter that does just as well or almost as well . . .