Koolance Cases - What's the deal?

Koolance water-cooled cases.....I was marvelling at one in the computer store the other day and was impressed with the idea. But as I looked at it more, it struck me that maybe the cooling was a little TOO isolated to specific components - the CPU, HD, Video card and the power supply. Granted, these are the greatest generators of heat in the computer, will the rest of the components suffer the lack of air moving over them? Is this even a problem? Do I worry too much about parts, that, in many computers, give years of service without any sort of cooling fan?
Do I want one just to tinker with something offbeat?
DO I ASK TOO MANY QUESTIONS IN ONE POST?

Sweating like a rancid chunk of pork

....and what about having that resevoir in the bottom of the case? Is the ambient temp in the case higher, or do they have it insulated enough?
Or is it such a large amount of coolant for the job, like having a 55 gallon radiator on your car, that it's not that hot to begin with?

Sweating like a rancid chunk of pork