Fantastic. For starters, the exegetical portion toward the beginning, outlining the philosophy of Hegel and Marx with relation to freedom and aesthetics, is quite nicely, intuitively put (something not necessarily common with the material).
Suther wants to stress this term of bio-aesthetics, this idea that art emerges organically as an element of the type of rational animal that we are. It serves a specific rational function - self-formative, self-narrativizing, a means by which we can grasp ourselves tangibly and relate to our historical, social situation.
The "literary function," as he calls it, is thus the expression of such a self-narrativizing (a condition of the unified rational experience peculiar to our species). And this of course manifests in modern literature in its characteristically fragmented, self-questioning way. Naturally there is plenty more than what there's space for here. But it is with this in mind that he conducts an analysis of modernist literature - specifically Kafka, Mann, and Beckett.
But what is really convincing is that he doesn't just paste some lens onto the texts, but examines them closely to find what actually arises intrinsically. There is no worry about anything palliative, no thinker is dogmatically left untouched, unexamined; he asserts his points alongside the textual evidence. It's for this reason that Suther provides a reading that demands to be taken seriously.
I found the Kafka chapter to be particularly informative, though perhaps due to my own comparative ignorance with Mann and Beckett. I'd recommend this to anyone interested in contemporary Marxism and critical theory.