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In my case I'm on ProCooling for two reasons:
1) Thermodynamics geekery - I actually find it quite interesting, and now I've graduated I don't really do any of that any more. ProCooling at least keeps me thinking about that sort of stuff.
2) Get as much theoretical and practical advice as I could for the watercooled system I've just built. It's a kind of hybrid of ProCooling and SPCR (and I do think there is a lot of potential for crossover between the two sites - a lot of users are common to both, and both sites often refer to each other in the forums at least), and is very, very quiet (loudest things in my room right now are the stereo transformer coils, TFT screen, flourescent lightbulb and PC. In that order).
The second part is where ProCooling is very good, simply because it doesn't appear to contain people who think they know what they are doing but don't. That is both rare and very useful indeed.