The Heideggerians love everything the man has written. I have no doubt they'll feel similar adoration regarding this volume, which contains several essays. I'm somewhat less receptive largely due to the fact his central premise results in a suspension of noncontradiction and, often, reason - and am of the opinion that the Heidegger corpus is glutted with unfinished (e.g. Being and Time most obviously) and often inscrutable works of questionable value (On the Way to Language, and What Is Called Thinking?).
In my estimation, after his quite lucid Introduction to Metaphysics (Nota Bene), and the magnificent Poetry, Language, Thought (Perennial Classics) and immensely readable (though it's tough to say accurate) volumes on Nietzsche, this is one of Heidegger's more interesting books, even if 2(5) essays border on filler. I don't particularly like the translation though, because, while accurate, the translator, Lovitt, seeks to retain too much of Heidegger's excessive neologism at the expense of readable prose and employs a stilted, overly literal translation style. I removed a star for that. I don't think each neologism merits half a page of footnotes. Heidegger is ungodly difficult to translate (as are most German philosophers after Kant) but the translator barely even follows conventions and uses odd choices of diction e.g. "As the essencing of Technology, Enframing endures. Does Enframing hold sway at all in the sense of granting?" (31)
There are five essays. The one I found the most interesting was the eponymous one where Heidegger talked about the essence of technology versus instrumentally as we generally do. His style is verbose, full of neologisms and a bit cloying but his overrall points are fairly solid even if others, like Spengler, had more precise (and better written) critiques. "The Turning" essentially continues the first essay and goes further into Enframing and Technology. "The Word of Nietzsche" is horribly out of place in this volume, but is a good essay that should be read in the context of Nietzsche: Vols. 3 and 4 (Vol. 3: The Will to Power as Knowledge and as Metaphysics; Vol. 4: Nihilism). It's probably the only essay in the volume that will make sense if you haven't read Heidegger before so I'd recommend reading Introduction to Metaphysics (Nota Bene) beforehand. "The Age of the World Picture" is a fairly mediocre essay where Heidegger talks in fairly broad terms about science and how it's affected metaphysics (his metaphysics, to be precise). "Science and Reflection" examines the phrase "Science is the Theory of the Real". At times sophistic in its abuse of etymology over reason, it's largely similar to the previous essay, and thinly reasoned. Mercifully, it's as thin on page count as it is on reasoning.
Limited recommendation.
Primarily recommended for those with any interest in technology and familiar with Continental philosophy. Spengler's somewhat similar Man and Technics: A Contribution to a Philosophy of Life is substantially more profound, but Heidegger is much more widely read. Be sure to read this Heidegger volume before reading Dreyfus, Stiegler, et al too. Nietzscheans will also find the summary essay of interest. And, of course, the Heideggerians that don't already own this will obviously enjoy it.