Never heard them (Score 1)

I don't need no centralised fault tolerant robust state of the art cooling system. The nuclear reacters might need it, but not me. the fans that come with my Dell PC work just fine. I 've got two of them. oh yeah! And I have got an AC duct right over my Monitor and no I don't live and work in the desert.

Noise!! what about the noise from the fans and the Harddisk and the CDROM

Well never heard them. I have got GNR and Metallica singing for me at full throttle on my sound blasters. I don't even hear the door bell or the car horn or the cow's moo, leave alone the odd guy shouting "The house is on fire". Ah! silence at last