big differences
Zalman < Tuniq < TRUE < Scythe Infinity < That AC cooler (its like $200)
Zalman products are good at cooling, but most of us here don't recommend them, because they are overpriced for the performance, as an Arctic Freezer pro 7 or 64 (depending on AMD or Intel) is about 1/3 of the price of most Zalman Coolers, and their temps would be maybe 2-5 degrees higher than a Zalman, and if they need the extreme cooling, we'd recommend a Tuniq over a Zalman