Just finished Milkman by Anna Burns.
Really had to struggle to finish it. It was given to me by someone who had given up after 100 pages. I found the structure of it very intense but I actually enjoyed it between about pages 50 and 300. It was like trying to listen to conversations on 3 radios playing all at once, each sentence had to be considered did it refer to the plot line, the societal environment of the locality or the main characters thoughts on her own existence. Turning each page to see another two pages with barely a break for dialog or paragraphs added to the sense that an awful lot was going on.
Spoiler: But, I found it meandered to an ending and I couldn't say I got anything from the part where her mother became the focus with her anxieties and worries. And she never challenged or explored the experience she observed with her maybe boyfriend or what it meant to their relationship retrospectively.