Summary: After about 15 months it started making clacking noises at high rpm. Now about 24 months, playing anything that requires a lot of cpu power just makes the thing scream for replacement, it is now unbearable.
Pros: It does a great job keeping the CPU temp low, compared to the stock cooler.
Cons: Noisy, large for what it does, don't expect it to last much more than 2 years.
Summary: Cheapest heatpipe heaksink to be seen for LGA1156 1155 775 AM3 AM2 FM1 socket. Without the spring loaded screw, it can be difficult to judge how much more need to tight/loosen the screw equally on each side so the bottom of the heaksink seat parallel to the top of the cpu. The instruction is unclear whether the screws should be fasten all the way down.
Pros: Good value, PWM Fan Control
Cons: No spring loaded screw, Instruction could be better
Summary: Do the extra research to make sure the adapter will fit your mATX motherboard. When they list what sockets it fits, at least for me, I assumed the backing plate would be adjustable to fit the board (since I've always used Coolermaster sinks, who have seemed to have mastered manufacturing an adaptable backing). So, if you're using an mATX board you may want to check with their customer support first.
Pros: $5 on Black Friday sale., Looks and feels sturdy., Similar design to heatsinks that are proven effective.
Cons: Advertises to fit an FM1 socket. The backing it comes with does not. Do your research!
Summary: This heatsink/fan is much noisier than I expected. The tall heatpipes create a suspended mass that the fan vibrates in a fairly loud low-pitched hum. I can feel the vibration not only through my case but through my whole desk. This "strumming" will also find any rattle in your case, believe me... Before I lost my sanity I found I could turn down the fan based on CPU temp through my motherboard BIOS because it's a PWM fan. Whew..
Pros: Very efficient cooler, Small size, Lightweight, Somewhat easy to install
Summary: Not bad, but not very good either. I have a cooler master hyper 212+. This Zalman is halfway between the 212 and a stock cooler in terms of cooling. I would not use this for any processor over 130W. This thing is not very noisy but definitely not silent. Mount design is one of the major flaws of this cooler. If you want to replace a socket 775 processor, you have to remove the cooler and the plastic ring or the processor won't come out. Try it and you'll see why.
Summary: Bought it on Black Friday sale. Does a better job cooling then the stock. Bought it for a server. I use 4U Norco case and its limited in the size of CPU heat sink that can be used. Little noise but really doesn't matter in a server.