After my last (stock) coolers fan died on me, I opted for this one as it seemed to get good press.
I`ve noticed a huge improvement over temperatures with idle avg: 17c & under load (Magicka) 27c, Guild Wars 24c, this thing just doesn`t seem to heat up much at all which is great!! :D
Whilst it isn`t overly bad, it isn`t silent, but nowhere near bad enough to be of any bother.
The only problem is the size of the thing, it`s huge. After installing in my setup, the brass pipes scrape/stick out of (albeit barely) the grille of the towers side.
Good job I`d already removed towers side fans or it wouldn`t of fit at all ;)
Also it covers my second memory slots (empty so far, but still...) might be a very very tight fit when I stick spares in.
Pros: Cheap as chips.
Does exactly what you`d want it to.
Comes with a tube of thermal paste (even though no mention on site about it).
Cons: The block is HUGE!, scrapes side of my tower.
May be a very tight fit for second memory slots (ASRock P55 mobo).
Not silent, but not loud enough to be a bother.
A little fiddly to fit, but then I imagine most coolers would be.
Overall, well worth the pennies & then some :D