Summary: That said, I get somewhat acceptable cooling, though a lot higher that I would have expected on a low power CPU (temps under load run close to 60C.
Pros: It's low profile, reasonably quiet, and fits in the case
Cons: The problem I have with this cooler, and probably the same thing others with poor cooling performance have is that it does not clamp down tightly enough to the CPU to transfer heat efficiently. At least not with my motherboard (Zotac GF9300) and CPU (Celeron 450 Conroe-L). The legs are too long, so the base of the heat sink doesn't clamp down onto the top of the CPU. You can tell because the legs are too easy to latch down. Maybe the 45nm CPUs sit up a little higher...
Pros: Has an attractive price, push pins certainly better than those on the stock HSF that came with the Intel E5200. The fan is very quiet. Under normal conditions keeps the CPU at 39-42C. Fits nicely in mini-ITX cases. Highly polished heat sink base, the craftsmanship of the product is way about it's $20 price.
Cons: Under protracted CPU load (100%), CPU temp goes to 50C, using Arctic Silver Ceramique. I would not use this HSF for higher wattage CPU's. I have an Adobe DNG Codec that allows you to see thumbnails of DNG files in Windows Explorer. After creating a folder and placing DNG files it it (for me, typically 30-50 files), when the folder is first opened, the DNG files are processed to make the thumbnails, and CPU usage hits 100% until processing is finished, a period of seve...
Pros: I've been shopping around for a good CPU heatsink/fan to use with my HTPC. This was the third one I bought and likely the last. It's small, cools very well, fits fine within a mATX case and is fairly quiet.
Cons: The motherboard has a fit occasionally when powering up with this fan. It spins slowly... Too slowly in the motherboard's eyes evidently. At first I was concerned, but I kept checking the temps and all was well. I blame the board and not the fan... It's not like it's a big deal, hit "F1" and it boots normally.