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I don't think anyone has said a bad word about the LP53. The VC45 and Engine 23 are to two low profile heatsinks that have been less favourably received: the VC45 for having a vapour chamber that is less effective than heatpipe-based coolers, and the Engine 27 because it can only deal with lower TDP chips without getting annoyingly loud (though works excellently on said low power chips).