Inside being: Heidegger and metaphysics

Is it wrong to say Heidegger developed a metaphysics of technology? It doesn't seem to be so. The distinction he makes between technology and the essence of technology, a distinction that proves to be the core of his philosophy of technology, is clearly a metaphysical one: what appears (technology) is rooted in something else that does not appear (the essence of technology). This is peculiar, for Heidegger is commonly known of course as a thinker who tenaciously tried to overcome metaphysics. In this paper, I wish to examine to what extent Heidegger's philosophy of technology is metaphysical, and to what extent it isn't. In doing so, I want to make clear how Heidegger could arrive at the statement that the essence of technology jeopardizes the essence of man, and why according to him insight can bring salvation here.