I've read three of the stories, "Rage" "The Long Walk" and "The Running man" and thought they were excellent. They're remarkable when you consider King wrote "the Running man" (hugely entertaining sci -fi thriller which is far superior to the film) in just 72 hours and was pretty much a kid when he originally wrote the "the Long walk" which features a stunning premise and is an exciting, poignant and very satisfying read.
I urge all Stephen King detractors to buy this book, the man is a great writer and its a shame that he's tagged with the misleading Horror writer label, which I think does him a great disservice, he's so much more than a James Herbert or a Richard Laymon. If you want thought provoking, character driven, unflinching, very readable tales then start with this.
Can't wait to read "Roadwork" now.