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Name brands should also have been mentioned. A 500watt Corsair is ten times better than than a 585watt Gigabyte Odin.
Nobody mentions the security offered by quality power supplies during power grid instability. Premium psu's can take surges and di, protecting connected parts... That alone is worth it!
Thats true. Still GIGAbyte is a brand I trust.
Anyway here is the article regarding the 80%+ Efficiency:
http://www.hardwaresecrets.com/article/Can-We-Trust-the-80-Plus-Certification/856
http://www.hardocp.com/article/2011/09/15/80plus_irrelevant_to_you_when_buying_psu/