I bought the 2cool pc plus for $35 and it does lower case temps and cpu temps a small amount no where near there claims....My system did not have alot of cooling so I kept it but I would not expect much with a system that has several fans for cooling already or even one that does not...mine had fan from power supply...fan on video card to keep it cool and alpha/fans for cpu...then added the 2coolpc plus(with the big fan) got 3-5 degree C reduction in case/sys temp and only 1-3 drop on the cpu...ther are probably cheaper ways too go...but it is very easy to setup and install.
This my 2 cents worth.
Neal