I have a P4 based shuttle as a HTPC. Been running strong for over 4yrs now. Runs cool and is quiet. I did a slight mod to it, I added a 120mm Fan to the rear in a Push-Pull with the stock 80mm fan internally. CPU never goes over 45c, and it almost always is expelling barely warm air. I have seen on a few of their cases that some may have bad air flow, but you can always do a little modding to get the result you desire.