The five-star ratings seem to have been written by thoughtful people who have actually read Green Hell and seem to be very helpful to would-be purchasers. In fact, of the 358 would-be purchasers who read the five-star customer ratings, 273 (more than 76%) thought the reviews helpful. In contrast, of the 304 who read the one-star customer reviews, only 64 (21%) thought them helpful.