Question : Problem: Pros & Cons of Liquid Cooling

I need to compare (Pros & Cons) of liquid cooled systems.  Are liquid cooling systems worth the hassle? Anyone have both sides of the story???

Answer : Problem: Pros & Cons of Liquid Cooling

here some pro's and cons (more space used ) :
http://compreviews.about.com/od/cpus/a/LiquidCooling.htm
more info :  http://computer.howstuffworks.com/liquid-cooled-pc1.htm
check this one too :
  http://www.howstuffworks.com/framed.htm?parent=liquid-cooled-pc.htm&url=http://www.tomshardware.com/2006/01/09/strip_out_the_fans/