Greetings, gentlemen. I wanted to pick some minds about Closed-Loop Water Coolers and their long-term longevity. I've got an Antec Kuhler 620 in both my brother's BitFenix Prodigy and my NZXT H2. Performance-wise, they're doing great. Being that Asetek and CoolIT are the OEM's for many prepackaged coolers, I'm curious as to people's experience with them. Coolant: Now, I know they're technically "closed" systems, but in the real world, things tend to escape so-called "closed" systems. Assuming I don't wind up puncturing the tubing, can anyone imagine a long-term problem developing, or will the loss of coolant be so minute that even after a few years it'll still be effective? Pump: I think I remember reading somewhere that we can expect about 3 or so years on average of functionality before the pumps may begin to fail. Does anyone have any extended experience using these or maybe better yet, horror stories to share? I see a lot of these types of coolers used in various builds and project logs so it's clear they're fairly well accepted. I know, realistically, if these coolers had any major, endemic faults, we would've heard something by now. I always keep an eye on temperatures just to be on the safe side. I'm really curious what people who've had them running a year or more have to report.