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I've only used the DiiCooler. The designer says Dii is the better of the two in the beginning of the Cii write up, but I suspect the difference isn't that great. Either is a huge improvement over the Monoprice stock fans. I'd suggest printing two of either one. If you ever have a failed print ruin the cooler, you won't be stuck printing a replacement without a fan or saving the old fan forever.