Collings' writing style will not be for everyone. He can be quite infuriatingly dense about some artists or concepts, and I found myself having to reread some sentences several times to see if it was 'just me'. It wasn't. On the other hand, most of the time he writes about art in a very accessible, and interesting way. His seems to be a fairly personal view, which is not going to suit anyone looking for an authoritative guide to art, but it is entertaining and thought provoking.
The paragraphs are quite clipped, and he just gets into his stride only to move to another subject or idea or artist, which when I was enjoying myself I found quite frustrating. I wanted more. This is not a particularly bad thing. I just found myself on Wikipedia a lot.
There are good illustrations, unlike some art books, and plenty of them. What could be a little challenging was him talking about paintings or works for which there were then no accompanying illustrations, which then sent me back to Wiki.
The potted history of the artists in the margins is a useful feature. I liked the way the book was broken up into manageable chapters and sub headings within chapters. The balance of prose to pictures was good. All in all a very satisfactory book given the dearth of affordable and useful books on what modern art actually is.