According to Australian rock music historian, Ian McFarlane, SPK were " at the forefront of the local post-punk, electronic / experimental movement of the late 1970s ... music progressed from discordant, industrial-strength metal noise to sophisticated and restrained dance-rock with strange attributes ".

According to Australian rock music historian, Ian McFarlane, Post is a stark, personal collection of acoustic songs that highlight Kelly's broadly based song writing skill.

According to Australian rock music historian, Ian McFarlane, they " played a fiery fusion of hard funk, aggressive rock, psychedelia and soul ( somewhere between Funkadelic, Led Zeppelin, Jimi Hendrix and the ' stoned soul picnic ' stylings of Sly and the Family Stone ).

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