AIO buildup using different metals. Ticking Timebombs

[JaD]

They pretty much rely on the use of anticorrosive and propylene glycol instead of water to make them last long enough to cover the two year warranty period, but of course the alu is going to corrode anyway eventually.

Performance is probably going to get bad before leaks develop, because the whole radiator's surface is going to corrode uniformly and clog up the blockI'm not sure if it's still as bad as the early days with 25% failure rates and pumps stopping anymore, but they're definitely on a timer. You might go as far as calling it planned obsolescence.

As zanza said, avoid asetek. They're the ODM for 90% of brand name AIOs. They only use alu, and they're huge cs. As he mentioned, some custom parts manufacturers like swiftech or ek also have some sort-of-all-in-one kits that, while more expensive, are more reliable and will perform much better over their lifetime, compared to cheap AIOs that might do well in the beginning, show good performance in reviews, and get progressively much worse.

AIOs with copper radiators do exist though, you just have to look for them. Alphacool provides units with copper rads to some manufacturers, but you'll have to double check each model. Be quiet uses them for their silent loop series, Fractal Design for their Kelvin series, and I'm sure more exist.