How Dangerous Is This Power Supply

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Friendly Greetings Everyone I Came Across This Switching Power Supply Circuit 15 Years A Go
It Was A Featured Article In Popular Electronics Magazine I All
Ways Wanted To Build It Now I Have The Chance A Friend Of Mine Advised Me
Not To He Says It Has Isolation Issues I Use To Think The Circuits In These Magazines
Were Full Proof Can Any Modifications Be Made To Address Isolation I Loved The Fact
That It Has No Transformer And Use Very Few Components So If Use To Power An Amp It Would Be Lightweight.
Please See Switching Power Supply Circuit From The Article Below

SWITCHINGPOWERSUPPLYCIRCUIT_zps4e01dc05.jpg
 
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