First off I'll say that I'm a little sceptical about the whole idea of a good/bad list, but I've been asked for something like this on many occasions. This is not intended to be exhaustive by any stretch of the imagination, I am not trying to assign each company to a category, nor to say that people should restrict their choices to a PSU in the Good list, nor to imply that all PSUs in the Good list are of equal quality. What I am saying is that if you purchase and use a PSU from the good list, you'll probably be getting a high quality, long lasting, realistically rated unit. If you purchase and use a PSU from the Bad list you'll probably be headed for trouble. As always, any additions are welcome. So, by popular request: Good: Acbel Polytec Akasa Antec Astec Asus Channelwell Coolermaster (N.B. eXtremePower 600W & 650W are substantially overrated). Corsair Delta Enermax Enhance Etasis FSP Gigabyte Impervio Lite-On Masscool OCZ PC Power and Cooling Seasonic Seventeam Silverstone Sparkle Thermaltake Toughpowers Ultra Wintact Wintec XClio Zalman Zippy Bad: Achieve Allied Apevia/Aspire Austin Can Power Chiefmax Codegen Colors It Deer Diablotek Dynapower Hairong Hyena JPAC L&C Leadman Linkworld Logisys MSI PowerTek PowerUp (Not to be confused with Power Up) Powmax Powork Raidmax units included with cases Real Power Enterprise Rhycom Sunbeam Turbolink YE Youngyear The PSU rebranding guide may also be a helpful resource here - if the company that sells the PSU isn't on this list, maybe the OEM is.