It's hard to compare this book to To Kill a Mockingbird, because it's a whole different type of book. Mockingbird was a perfectly constructed young adult literary story with a plot that involved the unfolding of a trial and the mystery of Boo Radley, which came together beautifully in the end. Go Set a Watchman, on the other hand, is nothing more than a young woman's uncomfortable weekend with her family back home, if you just look at the plot. And yet, the conversations she has with people during that weekend are fascinating. 
 I think the fact that they published this book at this point in time is so interesting. I find it amazing that this is the book that was written first, and that Mockingbird is what emerged from the editing process. Everyone in the US has read Mockingbird, and now Watchman comes along and throws us all completely for a loop. Because as it turns out, race is not a black-and-white issue; it's messy and uncomfortable and difficult sometimes to argue. This book is really just the tip of the iceberg; it's a conversation starter. And that goes along perfectly with the unrest that's going on in the States right now. Bad attitudes still exist, and they often have dire consequences. And yet, strangely enough, there are real reasons for the attitudes, if you can put aside your revulsion long enough to actually talk about it. 
 So, definitely read this book. Don't expect the kind of perfect story you read in high school (and couldn't fully appreciate back then). This is something else entirely.