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I ran one for a couple of years. It was a definite improvement over standard TMIC. I believe that some people have had problems with water temperatures, but I didn't have any such problems on mine. I didn't have aircon condensor rad in between the I/C and the rad though. I ran mine with a reversed manifold for a period of time, that reduced the pipework distances somewhat.
I've run one for about two years never had a problem with water temps, but the air con soon gets hot if you stop in traffic, fine if you keep moving though!