Who has read Brief History of Seven Killings start to finish?

As anyone who reads this blog will know, I do not shy away from reading and posting on complex, demanding novels and would not aandon reading a book just because it's a difficult read, but I have to say that Marlon James's A Brief History of Seven Killings pushed me to my limit and beyond. I am confident that, for those (few) who can make it through this 650+-page narrative that consists of a series of first=person narrations by a vast array of characters, will find much to admire and love and learn from in this novel; I accept that it's a report from the ground on life in Jamaica among the various street gangs and rastafarians and musicians from the 1970s and beyond. But I honestly cannot imagine reading this novel with the attention and concentration it demands and probably merits. Each chapter in and of itself requires extremely close reading just to figure out the patois, and the connections among the various narratives - at least for the first 80 pp or so - are tenuous and hard to fathom. Yes, some of the greatest classics are "difficult": Moby-Dick, Ulysses, Sound & the Fury, The Waves, each of which demands unusual line-by-line attention - but in each it's also fair to say that the narrative, the clearly delineated characters, and the details of setting hold our interest right from the start and keep us engaged; this novel, ambitious though it may be, is an in-your-face challenge to any serious readers, and I have to wonder how many have actually finished reading this book, reviewers aside (if they even did). There just isn't world enough and time.