I bought the CoolerMaster eXtreme after my last power supply had such a wide fluctuating voltage that it caused my computer to randomly power down, and so far, after a year of use I have not had the same issues with this product!
There are several things I love about this product, firstly at roughly £30 it is in the middle of the market; however I believe it is superb value for money.
Firstly the product is amazingly quiet, I've never noticed the sound of the fan in this power supply, even though it's huge! Secondly because of the large fan it is located on the bottom of the power supply rather than at the back, and this gives a superb cooling effect throughout my case. Finally installation is a breeze, all you need to do is to connect the four screws at the back and connect the power leads to the appropriate places, all these cables are bundled together in a big outer wiring, making sure that your case is both neat and tidy. My only slight issue with it was that the 4 pin peripheral connector wasn't long enough to reach to my hard drive, but extenders are easy to come by.
All in all this product is an amazing buy, and a superb power supply for the price.